even though apparently this has been in use by many people, i only found out about this recently and gave it a try.
http://www.mozilla.org/products/firefox/
a very well and effeciently built browser from one of the original web browser designers (mozilla, original netscape was based off this browser)
it features slim design, builtin popup blocker, built in search filed next to the address bar (you can select a serach engine and search it or the page without having to load that serach engines home page)
anyway its a really nice soft to try if you have any problmes with IE or just curious to try something new.