Heres the latest in the crawling saga. The matress is no longer a safe haven for hanging out because I took my eyes off him the other day and when I looked back he was half on/half off (leg and arm hanging over the edge - very cute stuff - but I was too worried about him falling to take the time to find my camera). The only thing that seems to be standing in his way at this point is getting his upper torso up off the floor at the same time as his feet. As it is now, he looks like a bucking bronco!
Also, since he is 4 months today, I have the official height/weight update:
26" tall and 18lbs 2oz! Hes up in the 97%-ish range! Way to grow, man!