Here is a video taken on day 2 of crawling... the "Grab and Drag" I call it. I was actually trying to get a video of him rocking back and forth on his knees because he was laughing so hard while he was doing it, but he was more interested in getting to the camera!
And here is a video of the first day of actual crawling. I was trying to get a video of the crawling, he was more interested in bouncing his butt to the Mickey Mouse Clubhouse Theme Song.
Both of my kids learned to pull themselves up before they learned to crawl... unfortunately I wasn't able to get a video of Sam pulling himself up when he started doing it. I did happen to have the video camera handy once when I noticed that he was already up, though!