You can easily find better pictures elsewhere, but here are some of the photos I’ve taken inside the Expo site so far (on a wonderfully crowdless day):
One of the ticket-selling areas. It will never be this spacious again.
Military guards at an entrance/exit gate.
The USA Multiplex...erm, Pavilion
A row of toilets. Have yet to try them out.
Looking up at the Russia Pavilion.
Workers on the Russia Pavilion
Welcome in the Netherlands
So-called Hong Kong Maxim's Bakery. 8rmb pineapple bun was so gross I couldn't even finish it :'(