Brian Harry has posted details here and here about Team Foundation Server SP1 Beta. To summarize, SP1 includes a few new features as well as several bug fixes and performance improvements. Some of the new features include:
- Extranet Support
- WIT Custom Control Support
- Support for Office 2007 (Project & Excel - no SharePoint 2007 yet)
- Detailed Merge History
- Ability to Separate SQL Analysis Services Server
Brian has also posted some various ramblings on Visual Studio SP1. This is an interesting read with interesting reader comments.On a (somewhat) related note, the Visual Studio 2005 SDK v3 RTM has also been released which includes tools, documentation and samples for developers to write, build, test and deploy extensions for Visual Studio 2005 (including Team Foundation Server).