For fellow geeks, Opera is giving away free registration for their browser in honor of their 10th Anniversary. Basically this means you can get rid of the ads in their free version.
Go here to get the registration codes. Be patient, their server is a bit slow now that Slashdot has picked up the story. I suggest you hurry, as it only lasts as long as their "party."
I've been an Opera user in the past, though I've favored Firefox lately. Perhaps this is a good time to go back.