I've been using slimbrowser from flashpeak and have been very pleased for some time. It's not only tab based browsing, but additional functionality such as pop-up blocking, quick clean trace, autologin, and favorite groups are some excellent features. It's been mentioned on Tech TV a few times, and worthy of checking it out.
http://www.flashpeak.com/

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic