I don't get excited easily but the Dolphin Browser [home.dolphin-browser.com] is the coolest most full featured browser I've yet to use on a smart phone.
Dolphin has easy to access enhanced bookmarks, a toolbar, add-ons, tabs, virtually everything you've come to expect from your normal browser.
Then it gets more interesting with GESTURES, one swipe of the finger and you can be at the bottom or top of a document, go back and forward, or assign a gesture to a URL and go places at a single gesture on the screen.
It will even become your default browser.
Only played with it for a day now but I haven't touched the default Android browser since, it's just that much better.
Best thing I've seen since Swype [swypeinc.com] :)