Comment DNS Problems (Score 1) 1231
Coming in late to the conversation, but what the hey.
The biggest thing I've noticed so far is that DNS lookup in the default install is CRAZY slow for me. I've read some posts about blacklisting the ip6 module or changing the name resolving order, but I'd rather not use a temporary workaround that's incompatible with whatever fix they eventually choose to implement. The bug is here, by the way: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/417757
Other than that, I've noticed instability in Flash, some general UI unresponsiveness, and a (now fixed) bug in the update manager that would throw up a kernel oops message.
It sure is pretty, though.