I know that there are websites to tell you your connection's general download speed. But, since the speed varies during a download, is there a program that'll show a constantly-updated speed display (like a car's speedometer) while I'm downloading something? I use the public wifi at the superkarket to get updates for Windows, games, etc. (it's about 20 times faster than my home DSL), and I'd like to know how much bandwidth others are occupying.