How about a sticky with a list of known plugin conflicts? This sure would be a time saver. For instance, I was unable to preview forms with conditional logic (blank page) and a forum search found a conflict with SexyBookmarks, which I use. Disabled SexyBookmarks, and viola! I can preview all forms with conditional logic! I was about to disable every plugin to diagnose, and this saved a lot of time and possible resulting headaches (disabling and enabling all plugins can produce brand new, unrelated headaches).
Anyway, if there were a list, one could check the most likely culprits first and perhaps save a lot of time and trouble.