It's more of an army crawl but he is getting faster every day.  He would probably do more of an actual crawl but he keeps doing face plants and rolling over and bonking his head on my unforgiving hardwood floors!  Ouch!  I got an area rug for him to play on but he gets off it fast.  It is very exciting to watch him set a goal and get to it!  Go Ben, go!  Now I have to be on my toes, and do some baby proofing!