Koders just released a product which integrates nicely with Team Foundation Server to help you perform a full-text search of work items or source code, either across your organization or across Koder's database of open source / shared source projects online. I love the tight integration with Team System Web Access!
For more information see:
· TSWA + Koders code search screencast: http://www.koders.com/corp/products/pro/demos/tfswa/
· Koders Pro for .NET Developers: http://www.koders.com/corp/products/pro/microsoft-net/