Like many a web worker, my browser of choice is Firefox. I favor it because it's less of a target for hackers than Internet Explorer, has good security features, and I make use of lots of useful extensions for it. However, I run both Firefox and Internet Explorer and frequently jump into Internet Explorer when I run into problems in Firefox, or when downloading new applications (this just seems to work more smoothly in Internet Explorer). If you, as I do, use Internet Explorer, definitely look into IE7Pro-a free download add-on that adds lots of useful features to the browser.