One thing that I'm seeing as a problem in most of the skins:
When you get a calendar/meeting request, the Accept/Tentative/Decline buttons don't really stand out. In fact, they sorta fade into the background, especially with the default theme. Obviously when you hover over them they show up, but the dark background, combined with the lack of a button border don't make them stand out much at all. I have had several people ask me about this so far.
Should I make an RFE about this?