Doesn't work for me... it's EXTREMELY choppy (it captured like 1 frame in every 5 - so completely unusable), and while it automatically recognises the active window to capture (some others I tried don't), it has no quick key to press to start it... so you have to have the game paused, click the program, then unpause the game. There didn't seem to be any options to set a key for recording... or for anything really...
CamStudio seems to be the best of the ones I've tried, except the quality is a bit low, and it has the slightly annoying thing that when you press the key to record, it brings up a box that you can use to set the size of the area you are recording, so you have to click that to make it go away and then it starts to record.... but at least it doesn't pause the game while doing that.
-- by the way, those links don't seem to work.... anyone using them needs to take out the forum part and add in http://www.dvdvideosoft.com/products
eg turn this: theoldergamers.com/forum/products/dvd/Free-YouTube-Download.htm
into this: dvdvideosoft.com/products/dvd/Free-YouTube-Download.htm