At Javapolis I 'looked after' a set of whiteboards on which all 2800+ participants were free to write up their ideas for improving their Java lives.
These were photographed at the end, and I've now extracted the information into textual format. So, if you were at Javapolis, or even if you weren't, you can see what was on the collective mind here.
As you look through them, you'll note that there were a few indicative votes taken. It appeared that developers liked the idea of closures and solving some issues with NPEs, but weren't so fussed about improving the foreach loop. There was also a vote about native XML, which showed a majority against the feature at present.