Lessons I've recently learned:

Just because your kids can read doesn't mean they should read certain things.

Telling your kids that they weren't listening to you will only encourage them to say that you weren't listening to them when they were trying to tell you something over and over again.

Keep cell phones away from babies because they can buy 3 songs on it (actually, the same song 3 times) at $2.50 each (not including tax), and then set that annoying song as your ringtone. (I mean, Soulja Boy, for goodness' sake)