Long Zheng (istartedsomething.com) has created a Windows Vista UI "taskforce" which will gather and record all known UI quirks in Windows Vista. Obviously, nothing can be guaranteed to be fixed, but Long will send the list to someone at Microsoft and hopefully get some results. He is asking for help in finding these quirks and there is already quite a big list of some interesting glitches in the Vista UI. These are also fixes that could lead themselves into "Windows 7" as well.
Head over to his site and check out the current list, and if you know of something that should be there, go ahead and submit it. You can also help out by spreading the word about the UI "taskforce" on your blog or social network.
Link: Window UI Taskforce
Update: Long Zheng has created a special website dedicated to the submission of any UI suggestions.