Yeah, this is off-topic, but I thought I'd just let people know that Gmail is now supporting new themes -- yes, your Gmail can be pretty now, without the aid of an additional plug in. Check their blog for details.
I'm currently sporting the "Tree" theme, in case you were wondering.
And if you don't see the "Themes" options in your Gmail settings, it may not be rolled out to you yet. Don't fret - Google says you'll be getting it within a couple days.