Diskeeper 2009 and HyperFast fully support Windows 7 and Windows Server 2008r2, and have since we released them back in December 2008. V-locity also fully supports the new Windows platforms.
That said, the next major release of Diskeeper (coming soon) will also take advantage of new functionality in Windows 7. Windows 7 allows for additional online metadata defrag, including $Extend (think USN Journal here) and also $Secure.
This past year, we've also been engaged with Microsoft's Front Runner compatibility program. Microsoft is going to great lengths to ensure the upgrade process (e.g. install Windows 7 upgrade over Vista) is seamless for their customers. Something I did not see with the Vista release, is the degree of involvement they have required from software vendors such as us, to ensure reliability and stability for users who take the upgrade path.
On to Undelete...
Undelete 2009 will support Windows 7 and Windows Server 2008R2 around the time that those new OS'es release to public (i.e. Oct 22nd). We'll post/email instructions for Undelete 2009 customers regarding how to get the new update when the software is available. All in all, supporting Windows 7 has not required significant code changes, but there's a great deal of quality control testing we always require before we can certify our software for release.
As part of that testing process, a few weeks ago several of our senior developers were at Microsoft's bi-annual IFS PlugFest. PlugFest is a meeting of file system filter driver developers that we've been regularly attending for years. At this interoperability forum, we can test our solutions alongside those from other manufacturers. The perfect timing of this event allowed us to test the updated Undelete on the new Windows platforms with file system filter drivers from other vendors. We also had the opportunity to test some new, very advanced (but as yet unreleased) new technologies!