People can now check the availability of iPhone 3GS at their local stores online, just like the last 2 years. This is a much needed service as usually Apple is low on stocks and people have to return empty handed. The page will refresh regularly with the latest stock info so you don't have to move out . . . Users can check if the exact model they'd like to buy is available, that is, 16GB/ 32 GB and Black/ White.
P.S. Currently the stock seems to be pretty strong! I believe Apple has already 'arranged' sufficient phones to avoid inconvenience like the last time.