Sorry, I thought I'd already replied to this, but it seems my response has evaporated into the aether...
Anyway, I'm not sure ill be staying in Beijing long enough to go the shipping route, unless I get it shipped to the hotel before I arrive.
Normally I carry all of my film with me when I'm travelling, but I'd heard there were lots of x-ray scanners about in Beijing (e.g., subways, museums, etc.) and I'm concerned about the cumulative effects of the scans, especially since I will already be travelling through at least six airports round trip, so thought it might be good to get some film out there instead.
For subway x-ray scanners, just open up your camera bag and show the guard as you walk past them. They are extremely flexible. Most local Chinese dont even bother doing that and skip the security check!