I can’t imagine needing to take a screen capture of a web site terribly often, but I have had to do it a few times in the past year. I used Snagit to do it, and it didn’t always do the best job–sometimes the program would crash, or the CPU would race and I would have to resort to ctrl-alt-del to get things back to normal–and not get my screen capture.
IE Capt is a small, standalone utility to do just that. Feed it the URL you want to capture, and it uses Internet Explorer’s Trident engine to render the page and outputs it to an image file for you. If you’re comfortable with the command line, it’s a faster, easier way to get your screen capture. And it’s free, which doesn’t hurt either.