1. Don't call an AI without the nuts, in general. I was doing this entirely too much esp. after a couple of winning hand in a row. In almost every case my top two pair got beat with a set.

2. Don't get drunk and try to move up from 5NL to 10NL without the proper BR just to see if the play is different. It wasn't much different but when I performed #1 the $$$ lost was a more significant hit to my BR.

3. Watch FTR videos and rewind when necessary to understand why certain plays were made.

4. Use Pokertracker. Previously I would fold to a PF 5bb bet. Now when I see the guy is a 70/60/6 I call or reraise and take down the pot.

5. Take more notes during the game. I now have almost 15k hands so I'm starting to see alot of repeat players.

6. Join IRC

Edit: Oh wait, you said top 3. Ignore 3 of these