The Apple online store has updated early and is now offering the iPad 2 for order. Estimated shipping date for iPads are from March 18 - March 25th. There is only "standard shipping" available.
Online sales were scheduled for 4am Eastern but appears to have started early. Apple is also selling the iPad 2 at their retail stores across the country, as well as Best Buy, Target, and Wal-Mart. We've outlined those options in a previous story.
Article Link: iPad 2 Now Available for Online Ordering