I've been having a good look around on Ubuntu Brainstorm over the last few days. There are some fantastic ideas there, and some.. not so good. If you think you have a good idea for the next release of Ubuntu, wether it's an appearance issue, or a software issue, then create an account, and let your voice be heard!
Many of the best ideas have already been implimented - so they do take action on what we say! A very good one that I came across was the following:
Would be great if we could help get a few more votes for this one, and hopefully in the next release of Ubuntu, we will see this feature.