Opera 9

Opera 9 has arrived on the scene somewhat quietly, but it has a lot of features rivaling Firefox and Internet Explorer 7 (which is now at Beta 3). From what I can tell, there's not much reason to switch if your a Windows user -Firefox pretty much takes the prize. But Mac and Linux users, REJOICE! There's finally something better than Firefox (arguably) - I say this because it has an excellent implementation of Flash on the Mac. On my OSX Tiger box, My son's favorite Scooby Doo game will crash after a little while, hanging the browser. It doesn't matter which one I use, Firefox, Internet Exploder for Mac, or Safari, it crashed. But Opera held up admirably. And when my kids are happy, I'm happy.