Microsoft Windows Vista launches for general purchase on January 29. If you want to get information about modifying and deploying your Open Source app in Microsoft Windows Vista, you should check out this blog item on Port 25.
There is a Q&A style interview about the Microsoft DevReadiness.org community site as well as other resources to help you get your FOSS app Vista-ready.
I suggest adding one more site in the list of developer resource sites you might want to visit in Vista-izing your FOSS app.
While it seems that nearly all of the FOSS applications I’ve tried mostly run fine under Windows Vista (I’m using Ultimate Edition), there are still glitches that turn up now and then. For example, it seems that Mozilla’s Firefox and Thunderbird do not successfully auto-upgrade in Vista. The auto-download works fine. But, the upgrade process itself errors out. Then, the download process is repeated and loops back to try to upgrade again. The workaround is to manually download the installer from Mozilla.com and run the upgrade as you would for a new installation.