Yup.
1. You must have a Tivo with two tuners, to record more than one channel at a time.
2. Shows are often syndicated, running on multiple channles, multiple times per day (like Will and Grace). You have to tell Tivo which showings to record or else it will record ALL of them. So you have to get a season pass and tell it to record only the first run episode and not the repeats, or tell it to record a specific time/channel.
3. You CAN shut off the stupid suggestion thing. We no longer allow TIVO to suggest programs it thinks we would like. TIVO was often wrong...VERY wrong ;-)
4. You can record two programs at once but cannot WATCH a third one that is being aired LIVE. HOWEVER you CAN watch a third program that has been already RECORDED, while the other two are being taped. Just go into the "No Playing" menu and pick a program that has been recorded and watch that while TIVO is recording two other programs for you.