(uncompensated blatant plug)
I've been trying out on my laptop the past fews days an internet browser called Avantbrowser. It runs over top of IE (you have to have IE installed, etc), and has several features that IE does not. It uses the MDI interface to give tabbed browsing in IE, has a pop-up blocker, a form filler, and a search bar similar to the google bar, except that you can specify your search engine. I've been playing with it for a bit, and like it enough that it is currently my default browser.
Try it out - tere's an active user community too, it appears by reading the forums).