Well, Ubuntu 11.04 has been out for a little while now, and lots has changed. My verdict, in case you care? Meh.
- Unity's panel is vertical
- More vertical space
- Better use of compiz
- Low panel customization
- No panel plugins
- Default icon size sucks
- CCSM causes desktop freezes
- Scrollbars "improved" - interferes with resizable panels
Lots of very visual things have changed, mostly in the introduction of Unity to the desktop edition. More config is done in CCSM (CompizConfig Settings manager), which seems to cause your whole desktop to seize up when enabling or disabling different functions, or at the very least stops your top toolbar, which now hosts your menu bar, from rendering correctly until you reboot.
That said, it could have been a whole lot worse. Once I found out how to customize it (tips coming soon), I do appreciate the extra space, and Compiz has become a much more mature and reliable system in the 5-6 years I've been playing with it.
But I've got to say, as a Software Engineer, I wouldn't have shipped it yet. Roll on 11.10...