The following is a quick list of things to jot down. For the single person or Gm that wants to have their own Journal to write up that has their own particular flair, a small tape recorder works the best. Just put it on record at the times you feel it is important to your Journal and then compile a journal at the end of each session. The best part about this one is the fact that you can also record some of the cool and exciting quotes from the characters about the villains, situations or strange spoutings. Audio tapes have to be changed frequently and a tripod for a Camcorder gets in the way.
Extension cords solve the battery problem but get underfoot.
A game session can turn into an 'I love lucy' skit when the guy playing a barbarian trips on the cord and catapults your two hundred dollar Camcorder into the dining room wall. There is no hands-free technique unfortunately. So make it a real goal to keep a journal and then do it. Do it every session and don't get frustrated if you feel you're not doing a perfect job. Just by keeping up with it your skills will improve, journalizing will become habit and therefore much easier.