Here is a little video of of him crawling across the living room floor. You can also see at the end of this video him pulling up. I think that was his motivation to start crawling. He would get himself over to the couch or coffee table, just to be able to pull himself up.
Our life with a stationary baby is now officially over, and we are on constant watch. No more leaving him in the living room playing, and expecting him to be where we left him. I had to breakout the baby gate this morning just to keep him contained while I was in the shower.
Let the adventure begin!