Uhh, it's a hot day: first the visual studio 2010 beta 2 has came out and now JetBrains released first public available build of the ReSharper 5.0 :)

Here is download page: http://www.jetbrains.net/confluence/display/ReSharper/ReSharper+5.0+Nightly+Builds

What's New in ReSharper 5.0

• External Sources
• Structured Patterns
• Project Refactorings
• Call and Value Tracking
• Internationalization
• Visual Studio 2010 support (coming soon)
• ASP.NET markup support
• ASP.NET MVC support
• Intellisense improvements
• Bookmarks
• Inspect project/folder
• Upgrade-to-LINQ analysis
• Native NUnit support
• Xml Formatting

Here you could find more info about R# 5.0 futures: ReSharper 5.0 Overview