Since .NET Framework 2.0 there is a very easy way to perform an asynchronous HTTP request and retrieve the result as a string.
The System.Net.WebClient class provides methods and events to handle this task in a very convenient way:

void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
   if (e.Error == null)
   {
      string result = e.Result;
   }
}

Windows XP:

Use your_computer_name / console

Windows Vista

Use your_computer_name /admin  

To simulate Ctrl-Alt-Del press Ctrl-Alt-End. Pressing Ctrl-Alt-Del will open the Task Manager on the local machine.

Reboot and restart:
- "shutdown" to shutdown
- "shutdown -r" to reboot
- "shutdown -i" to get a GUI
- "shutdown -l" to logoff

The MS client also allows Ctrl-Alt-Break to switch between viewing the session in a window and on the full screen.

To change the port number of the remote desktop server:
The setting for the Terminal Services port lives in the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp
Open up Regedit, find this key, look for the the PortNumber value and change it to whatever you want.

To connect to a remote server with a non standard port (other than 3389):
Use the computer name, followed by a ":" and the port (e.g. www.mymachine.com:6789)

If you open an office document from a sharepoint 3.0 / moss 2007 site from the extranet, you will be asked for your credentials several times. Here is a summary of possible solutions and workarounds I found about this issue:

KB 941853 addresses the issue where "Automatically detect settings" was required to be enabled in order for the Automatic configuration script to be processed for WebDAV communication. With 941853 installed, the "Automatically detect settings" can be either enabled or not.

KB 941890 includes the fix from 941853 and in addition will assume (in an environment where no proxy server is configured in the IE settings) that a site that has no dots in the name will be treated as an intranet site (e.g. http://companyweb is intranet while http://www.mycompany.com is Internet) and credentials will be passed automatically for WebDAV communication.

- For IE7 the equivalent is adding the site to the Intranet Security Zone.

- Only NTLM can automatically send credentials

- Convert all Office documents to Adobe PDF. For documents that need to be available in the native Office format (.doc, .xls, .ppt, .vsd, etc.), compress them as .zip files. Use the .pdf and .zip files in the document libraries instead of native Office files.

- You can completely get around this by publishing your Sharepoint from behind an ISA 2006 server when in Form Based Authentication.

When you publish using Form Based Auth and select "Private Machine" at login, you will be given a cookie that both IE and Office will read that will authenticate you to the AD/Sharepoint for each request.

- Open Documents in Read-Only-Mode

RESOLUTION
To resolve this issue, do the following:
1. In Windows Explorer, find the Htmltransinfo.xml file. This file is located in the following folder:
<driveletter>:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\Template\Xml
2. Right-click Htmltransinfo.xml, and then click Edit.
3. Edit the file to set ProgId to empty (for example, ProgId = "").

The following is an example of how the Htmltransinfo.xml file looks before you make the edit:
<HtmlTrInfo>
<Mapping Extension="xls" AcceptHeader="application/vnd.ms-excel" HandlerUrl="HtmlTranslate.aspx" ProgId="SharePoint.OpenDocuments.2"/>
<Mapping Extension="doc" AcceptHeader="application/msword" HandlerUrl="HtmlTranslate.aspx" ProgId="SharePoint.OpenDocuments.2"/>
<Mapping Extension="ppt" AcceptHeader="application/vnd.ms-powerpoint" HandlerUrl="HtmlTranslate.aspx" ProgId="SharePoint.OpenDocuments.2"/>
<Mapping Extension="pps" AcceptHeader="application/vnd.ms-powerpoint" HandlerUrl="HtmlTranslate.aspx" ProgId=""/>
<Mapping Extension="one" AcceptHeader="" HandlerUrl="" ProgId="SharePoint.OpenDocuments.2"/>
</HtmlTrInfo>
The following is an example of how the Htmltransinfo.xml file looks after you make the edit to set ProgId to empty:

<HtmlTrInfo>
<Mapping Extension="xls" AcceptHeader="application/vnd.ms-excel" HandlerUrl="HtmlTranslate.aspx" ProgId=""/>
<Mapping Extension="doc" AcceptHeader="application/msword" HandlerUrl="HtmlTranslate.aspx" ProgId=""/>
<Mapping Extension="ppt" AcceptHeader="application/vnd.ms-powerpoint" HandlerUrl="HtmlTranslate.aspx" ProgId=""/>
<Mapping Extension="pps" AcceptHeader="application/vnd.ms-powerpoint" HandlerUrl="HtmlTranslate.aspx" ProgId=""/>
<Mapping Extension="one" AcceptHeader="" HandlerUrl="" ProgId=""/>
</HtmlTrInfo>
After you edit the Htmltransinfo.xml file, you can open Office documents in read-only mode on a Windows
SharePoint Services Web site that has its directory security set to anonymous access. You are not prompted
for authentication.

Do you know the Martingale strategy?
If not, have a look at http://de.wikipedia.org/wiki/Roulette_%28Gl%C3%BCcksspiel%29 (german) or http://en.wikipedia.org/wiki/Roulette (english).

If you still believe that this strategy could work, try out this small simulation software (in german, sorry, but therefor it's free of charge and you don't have to bet real money ;-)).

The simulation sets on a single change (red) and doubles it's bet on every lost round. Without a table limit and with unlimited money this strategy would work! But believe Albert Einstein who is reputed to have stated, "You cannot beat a roulette table unless you steal money from it.".

Server’s free disk space:

xp_fixeddrives  

Determine logspace: 

dbcc sqlperf (logspace)  

TempDB size:

 sp_tempdbspace  

select 
   current_timestamp as Time,
   user as Benutzer,
   system_user as System_Benutzer,
   current_user as Current_Benutzer,
   session_user as Session_Benutzer   

sp_who2 


Useful stored procedures: 

sp_helpdb -- Displays information about all databases on the server
sp_helpdb databasename -- Displays information about a particular database
sp_help objectname -- Displays information about a table
sp_spaceused -- Displays information about the space used in the current database
sp_tables -- Lists the tables in a database
sp_helptext name -- Displays the code used in a particular stored procedure
sp_dboption -- Sets or returns information about database options    

Oracle

Get all tables including the system ones:
SELECT table_name FROM all_tables;

That will give you only the tables owned by the user that you are connecting as:
SELECT table_name FROM user_tables;

Query table columns:
SELECT * FROM all_tab_cols WHERE table_name = 'whatever table name you are looking for'

Looking for comments on the tables:
SELECT * FROM all_tab_comments WHERE table_name = 'whatever table name you are looking for'

SQL-Server

That will give you all tables:
SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'

You can save your data during a HttpRequest by passing it to System.Web.HttpContext.Current.Items[itemKey].
Objects stored in this Collection will be available during the whole lifecycle of the HttpRequest.

Example of usage:

System.Web.HttpContext.Current.Items["reloadCount"] = 5;

int reloadCount = (int) System.Web.HttpContext.Current.Items["reloadCount"];