or you could pony up for a DVR.
You don't need to go all out for a TiVo, Camcorder, or DVD-R recorder. You can use the old VCR (in non-HD mode) or get a tuner card or a video input dongle for your PC (many newer PCs already have this).
Record what you like, delete what you don't, make a video montage, post it on YouNube, and be ignored like the other 17 million game montages already out there.
Basically i thing that either in the next Call of duty game or the one after killcams should be saved per 2 to 3 matches or less if need be so you can show off that sweet snipe or amazing 4 grenade kill. Also For challenges after you complete lets say flyswatter it should have a number next to it saying how many times after you have shot down a helicopter. This is just my personal opinion and i believe that it would be nice thing for bragging rights and to show and save.