It appears that just hours after the iPad 2 orders were allowed online that Apple has pushed the shipping date from 3-5 days to 2-3 weeks. When I first checked this morning all 18 models had 3-5 day ship time. They have now changed their site to 2-3 weeks.
Apple is probably playing it safe with the dates, and is trying to calculate all the orders against the stock they have available, but the 2-3 weeks puts them on par for when the rest of the world is allowed to order the iPad 2.
On the other hand, Apple is also perfect marketing strategists. If they have long lines at the stores, right before the 5 o’clock news, it doesn’t matter how many they actually sell. It will seem like “everyone” is waiting to get one.