At it’s peak, the iPad 2 shipped in 4-5 weeks from the Apple online store in the United States. Now, Apple’s second-generation tablet is shipping in only 1-2 weeks. It seems that Apple is really clearing up any production, supply, or shipping issues that they may have had. Apple stores are still a difficult place to find an iPad 2, so with a 1-2 week shipping time, the online store may just be your best bet.
Update: MacRumors notes that the shipping time has dropped to 1-2 weeks only in United States, Canada, Mexico, Australia, and New Zealand but is still at 2-3 weeks in many European countries. These things usually work their way around the world, however.