You're welcome Vagabond. Just to expand on my thread and comment on some of the posts in this thread. The evening entry ticket is only available at the site, but all the other tickets can be bought in advance at major branches of China Post, Bank Of Communications, China Mobile, and China Telecom. I bought mine at China Post, which was very straight forward, even if I didn't speak Mandarin it would have been possible.
Only the China Pavillion has reservations to get in, Taiwan may as well but it was closed the day I was in the north Asia area. The remainder have queues to get in. Just follow my advice about going in the evening and you can avoid the long queues pretty easily or borrow somebody's baby to cut to the front
Typhoonpilot