If you're willing to spend the $20 reg fee, I recommend Guncam.
I've found it to be an invaluable tool for several reasons but primarily for the freedom it gives me. I record films in AH, obviously, but I rerecord and convert to AVI in Guncam while viewing it in the film viewer. While that adds a step to the videomaking process, it gives me control of what I record, how much, different shots, etc., and best of all, I can capture in-game voice and sounds, which is something the AH Filmviewer AVI converter won't do. Then you can splice the AVI bits converted from Guncam within MS Moviemaker, Vegas, Premiere, VirtualDub,or even within Guncam itself (but that feature set is still a little limited so I prefer something like MSMM or Premiere). If you don't care about sound, or unlimited record times, by all means go with Fraps, but personally, I've found Guncam to be worth the price.