I have been using the free trial of Bandicam, and with up to a ten minute full-feature recording time, it's pretty good. How about you guys/girls out there? What do you prefer for a free recorder?
FRAPS is really good as long as you have a second hard drive. If you don't, I recommend dxtory. It records without lag but you might get some ridiculous file sizes.
Fraps absolutely sucks, sorry to say, even recording to an SSD. Haven't tried Dxtory, but I might.
I've alway loved the Camtasia Studio/Recorder, but of course it cost money.
There is a 30 trial though.
Oh, and here is a webpage with a set of I guess good screen recorders. I haven't tried any of these out, but you might be willing to try. http://www.hongkiat.com/blog/win-screen-recording-softwares/
It's built-in, just press ctrl+shift+alt+r to start and stop the recording, it works great without slowing the system down and produces nice small webm format files with full resolution quality that are saved automatically in your /home/<user>/Videos directory.
I use dxtory and fraps. Fraps is a backup if games dont like dxtory.