I mentioned camstudio recently. Today I found an alternative solution, also free. Wink. It can’t output to video (it only outputs to flash) but it’s more featureful in terms of markup and presentation tools you can use to overlay instructions, text, audio, pictures and so on onto the screen recordings you make. It also runs on Linux as well as windows. Again no mac version unfortunately, though since this runs on linux there is at least some hope that it will ultimately run on a mac. This is another package that we’re evaluating for training and documentation purposes. If you need to do screen recording on your windows or linux machine this is well worth a look.