Internet Explorer 8 was released today. I'm sure it's already been downloaded a billion times already, but you can get it here.
My first impressions have been favorable. I've been using Slim Browser for quite some time, but it still uses the IE7 engine and the performance has been lackluster as of late. I've stuck with Slim Browser over the last couple of years due to features like double-clicking tabs to close sites and not having multiple browser windows open when going from an internal to external site. These items seem to have been addressed in IE8 and so far I'm impressed with speed and functionality. Try it out (Windows users) it's free.