I go on Zap2it listings where I have an account setup, it remembers my favorites and shows me a guide for only the channels I want shown. When I get on there to check out the next week, I just scroll down each day and note whats going on on what channels. I do this for two reasons, I use my list to check and make sure a show I have a timer setup for is actually recording that week and not being skipped for some odd reason, and two I use it to look for "New" shows which are marked clearly on Zap2it. I used to use the same process but paid for a tv guide, I decided to dump the tv guide subscription.
Here is an example of what my Zap2it looks like, I could actually just use it to look for premiers only, but I dont trust auto timers enough to not check behind them as well
. I just note what shows should be recording by day and channel for a week on a notepad, then check my timers.