I've always been a fan of FRAPS
http://fraps.com/ as they were the first people to really make it work without impacting game performance. They're a little old fashioned and many of the younger guys use Open Broadcast Software
http://obsproject.com/ as the UI and setup is a more modern.
Neither one is really superior to the other from the perspective of the video file generated but OBS is open source and donateware vs FRAPS being a more old school shareware with a purchase to unlock some of the higher end options. I purchased into FRAPS when they were the only game in town but once you purchase it you don't have to purchase again nor have multiple licenses for all your PCs.
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