I'm using Opera (http://www.opera.com/
). It calls itself "the fastest browser on the planet." And yes, it really is faster than IE! Transfer speed is the same, of course, but it is more efficient in how it loads information. It also uses tabs, but it has many additional features as well. You can zoom in, which is nice when you want to see a picture better and especially when you get one of those sites with itty bitty text. You can block any pop ups, which is great. The best feature, in my opinion, is mouse gestures. This allows you to navigate with the mouse. So if you want to go back, instead of moving your mouse to hit the back button, you just right-click and shift your mouse to the left. Same thing for going forward, but the other way. If you want to open a new page, just right click, move mouse down. It saves a little time, and after using it for awhile it just makes things so much smoother that it's hard to go back to the normal way of surfing. Oh, it also has a search field in the toolbar, and you can customize which search engine it uses, but by default it uses google. You don't have to go to google first and then do your search. This is just another small convenience that I miss when I use another browser.
The only limitation is that it sometimes has problems with pages that are optimized for IE. In that case, there's also a browser called myei2, which just runs on top of the normal IE but adds some of the features available in Opera, like mouse gestures, tabs, and ability to block pop ups, but it has all the functionality of IE. I have the install file, but for some reason I can't get to the site I downloaded it from.