Our big man is officially pulling up!! This morning when I went in to get him, he was sitting up in his crib, which was a first! Then when I went to visit him at school at lunch, his teachers said "has he ever pulled up in his crib?" When I told them no, they showed me the pictures they had taken. Sure enough, the little guy was standing up chewing on the crib rail.
As promised, here is a video of Jack's floppy-armed bye-bye:
And, here's a demo of the current "crawling"