Try MyIE2, a shell for Internet Explorer. Once you use this you'll never go back to plain IE. Too many features to list including mouse gestures.
Not quite as good but still excellent is Myweb4net and Avant Browser.
I've been using MyIE2 as well. Just about everyone I've shown has switched. I've tried the new firefox but found that it wasn't as feature rich and lacked good tabbing prefernces.