I upgraded my Ubuntu 8.10 (32 bit) to Ubuntu 9.04 (64bit), and the difference is amazing.  There are little things, like the new notification system and slightly different themes, but the BIG thing is SPEED.  Everything is faster.  It boots faster, it opens programs faster, Compiz’s framerate is much higher….I’m very impressed.

Now just waiting for Firefox 3.5 to be released.