I've pretty much made the switch to Mozilla's Firefox as my primary browser. I find that browsing using tabs makes my life much, much easier—especially in regards to surfing message boards.
My biggest complaints with Firefox's tab interface have been with the inability to resort the tabs using drag-n-drop and the ability to configure things so that links that target a new browser window are opened in tabs instead. Well, thanks to the person/people over at Outsider Reflex they've released the "Tabbrowser" extension for Mozilla.
This is a must download for anyone using Mozilla and who uses tab to do their surfing! Finally, no more new window spawning—everything in one nice window!