I upgraded to WordPress 3.0 today; Mondays are best for such tedious tasks.
I’ve been holding off upgrading for a while now because the “automatic upgrade” doesn’t work for me, manual upgrades aren’t all that fun.
It wasn’t as painful as I had anticipated, except for some plugins that wouldn’t play nice.

I also change my theme, I loved my old theme but I didn’t like the way it looked on the iPad.
I like this new theme, it’s understated, clean and minimalist, with the header alternatively at the bottom of the page.