"IntelliSense Code Snippets are reusable, task-oriented blocks of code. Visual Studio 2005 includes code snippets covering tasks ranging from creating a custom exception, to sending an e-mail message, to drawing a circle."

http://msdn.microsoft.com/vstudio/downloads/codesnippets/

1. Application Code Snippets : For working with Isolated Storage, ClickOnce tasks, Console Applications and Process Management.
2. Collections and Arrays Code Snippets : For tasks like creating, iterating, locating elements, and sorting collections like arrays and dictionaries.   
3. Connectivity Code Snippets : For checking network status, downloading a file via HTTP, performing serial port operations, sending email and more.   
4. Crystal Reports Code Snippets : For common reporting tasks such as printing a Crystal Report, setting report parameters, and configuring report data access.   
5. Database Code Snippets : For performing a variety of common tasks around ADO.NET data access.   
6. Datatypes Code Snippets : For various string conversions, date spanning operations, and other type-focused operations.   
7. File System Code Snippets : For performing a number of tasks around reading, writing, and managing files.   
8. Math Code Snippets : For calculating monthly payments, depreciation, sines, cosines, and random numbers.   
9. Operating System Code Snippets : A large collection of snippets for Event logging, Message Queues, Process management, registry access, windows services, getting system information and more.   
10. Security Code Snippets : For working with hashes, decrypting, encrypting, and getting a user’s name.   
11. Smart Devices Code Snippets : For performing common tasks on Smart Devices.   
12. Windows Forms Code Snippets : For working with the clipboard, fonts, sounds, GDI drawing, and general Windows Form and control creation.   
13. XML Code Snippets : For reading and writing XML, selecting nodes, performing XSL transforms, and other XML oriented tasks.

Be sure to download the install package that includes all categories in one file. Click here if you can't find it.