A few years ago we began taking notes during our gaming sessions. This has proved to be very valuable since we only meet every 2 weeks for a 5 hour session. We note every spell cast and other miscellaneous activities between battles, but once we get into a battle we track each characters action each round. This allows us to review the activities of previous weeks to determine what spells we have left, what state we are currently in ("Hey, I forgot that I am invisible right now!"), hit points remaining, etc.
We found it fairly easy to have one person take notes on their laptop during the night, then e-mail that document to all the others.
