Microsoft published a list of the applications that have received either "Certified for Windows Vista" or "Works with Windows Vista" status. Of the 787 listed, 103 are Microsoft's own products, indicating few software developers have completed the logo process.
104 applications thus far have been deemed "Certified for Windows Vista," including a number from Trend Micro, ArcSoft, CyberLink and Corel's CoreDraw. Software from Adobe, Symantec, McAfee and other major vendors has yet to make the list, which Microsoft says will be updated each week. The small number of applications could be why Microsoft is offering to pay up to $1,000 to a third party certification company for software developers to test their programs.

This list will be updated weekly

http://support.microsoft.com/kb/933305

600 non-M$ products seems pretty good for an os that has only been officially released for a couple months.