Greate news for ReSharper fans: the ReSharper for Visual Studio 2010 (Preview) is almost here!!!
Guys already made a page for Nightly Builds. They says: "We need few more days to run a quick QA run around the bits."
Also, it will be a technical preview not a betta:
ReSharper for Visual Studio 2010 (preview) - is an early build for those who are trying out Visual Studio 2010 and cannot live without ReSharper. It is neither 4.5.1 for VS10, nor 5.0 for VS10. It is intermediate result of our attempts to integrate with Visual Studio 2010 extensibility model, plus preliminary state of some of ReSharper v5 features (you will find some of them enabled). Complete roadmap for ReSharper v5 will be published soon.