I've been out of the loop regarding Linux desktop developments for a few years now. I read what's 'going on,' but rarely ever check it out.
I downloaded the Ubuntu Live CD about an hour ago and started tinkering with it. Honestly it seems more than ready for the desktop. I'm not going to leave OS X any time soon, but the claim that Windows is somehow less confusing is totally out the door. The Ubuntu interface is good enough for any grandma to use, with a lot less clutter and confusion than anything Windows provides.
If Ubuntu could get some designers and artistic folks on their team, things could shape up nicely.