I upgraded to Ubuntu's Edgy Eft release candidate last night (the final release should be tomorrow). It's pretty nice. The main upgrade for me is that it comes with Firefox 2, which (among other improvements) spell-checks all text boxes in forms.
Of course, the dictionary isn't always complete, especially when there are proper nouns involved. It had the following suggestions for "Voldemort":
Interestingly enough, all of them are quite appropriate.