MSDN Code Gallery is storage for sample applications, code snipplets and other resources. And also you can find the conversations about these resources. To see supporting documents (Screenshots, design documents) inside resources makes it richer.  They are open to your contribution ;)

http://code.msdn.microsoft.com/ 

I thought it gonna be fine to cross-post it from Patterns & Practices Guidance:

• Patterns & Practices Practices Checker - ASP.NET Web Applications Performance Code Review

The Patterns & Practices Practices Checker is a tool that helps you verify your applications against the patterns & practices performance recommendations for ASP.NET applications.

• Use Practices Checker to help you perform a manual code inspection by analyzing your application for potential coding and configuration settings that do not adhere to the patterns & practices ASP.NET Performance Checklist.
• Extend Practices Checker by allowing additional checklists to be created and checked.
• Developers can utilize built in search routines to search intermediate language, static text files and .configuration files for specific code patterns or settings.

Learn more.

The Windows Live Messenger IM Control enables web sites to show the presence of Windows Live Messenger users and lets site visitors engage in instant messaging conversations with the Messenger users. A Web site can invite its users to share their Messenger presence and exchange messages with visitors to the site. When a site hosts the Windows Live Messenger IM Control, site visitors can instant message Messenger users directly from the browser without installing the Windows Live Messenger desktop client on their computers.

This pretty good control is easy to use. You will only add the IFrame code that Live messenger gives you then you can start having conversations with your visitors of your personal web page and blogs easly.

Helpful links,
ScreenCast
Article
MSDN

Enjoy ;)

Doga.