I'm sticking with Opera 9.6. The interface looks really nice and I love the smooth scrolling. It seems quicker than IE, except when it comes to myspace pages. It's a bit glitchy when I watch youtube videos, too. The width of the page won't be set properly and you can scroll WAY to the right, and youtube pages don't load properly sometimes. It's still a good browser though.
On my plain computer I use IE8 I think. It's nice because if IE crashes for some reason, all the webpages that were lost will be recovered if you reopen IE. The different colored tabs are also cool. What's really annoying though is when I get pop-ups from IE asking for my opninion on it.