Here’s a very good explanation and demonstration of Push Hands and sparring by Guo Shufu.
I’ve watched this clip several times. The first few times I concentrated on reading the subtitles and then focused on the actual demonstrations.
It’s certainly a great resource if you want to learn the finer points of Push Hands and tips on sparring.
[youtube]http://www.youtube.com/watch?v=bYFcUxep9TE&feature=player_embedded[/youtube]