I started keeping a campaign journal in late 2008, finding it necessary to do so if I wanted to actually remember what we had been doing in-game. What I usually do is summarize the session, and then I'll eventually list monsters and treasure. One of the other players in the group will itemize the treasure and determine Challenge Ratings for the monsters we've fought and parleyed with.
Here's an example of an almost continual campaign journal, in which I was a player (screen name Sacrificial Lamb), where you can watch the campaign flourish and then eventually fade out with a whimper. It includes maps, pictures, monster lists, treasure tables, and even a few feats and incantations:
Also, I just began a social group and journal on this website only weeks ago, but I'll soon include maps and treasure tables and whatnot. It's a work-in-progress.
I hope these examples help.