If you're working on a Vista rollout, one of the key aspects of such a project will be application compatibility testing. This is not as complex or time-consuming as most people think - the Application Compatibility Tool can automate a lot of this, and the level of application issues found is typically a lot less than you would expect; that's certainly what we're finding in our work with customers - with one customer who had approximately 600 applications, 2 were found to be incompatible with Vista. For both of these the vendor has new versions that are Vista-supported.
Anyway, back to the topic of links...
For a very quick analysis of an application's status, check out http://www.windowsvista.com/appreadiness. This site is updated weekly, and enables you to search by product or vendor name. You should still use the ACT for a more detailed check for your own environment, but this site is a handy one if you haven't got ACT in place yet.
All our application compatibility information is now in one place. Technet now has a TechCenter for all things appcompat related, covering tools, guidance, communities etc. The link is http://technet.microsoft.com/en-us/appcompat/default.aspx.
Microsoft, Windows Vista, Application, Compatibility, Tool, Links