Namur: You should really grab
FRAPS. You can take all the screenshots you want without having to alt tab out of the game to paste the pics, you assign a hot key and just press it during gameplay whenever you want to take a pic. You can record gameplay videos too, although in the free version i think videos are limited to 30 seconds.
Yeah the free version of FRAPS limits videos to 30 seconds and adds a watermark. It also only allows screenshots to be taken in bitmap format (but there's no watermark). So unless you're picky about your screens or really want to take video, the free version of FRAPS works fine.