Apple’s online store is now accepting orders for the iPad2. Orders were not to be accepted before 4pm (EST). That has changed (for now).
There is a limit of 2 iPads per order. Currently, the iPad will ship in 3-5 business days in your choice of black or white.
(UPDATE: 7:42 am (EST) As of now, orders will ship in 5-7 business days)
(UPDATE 2: 11:15 am (EST) As of now, orders will ship in 2-3 weeks)
(UPDATE 3: 10:50 pm (EST) 2011.03.12 As of now, orders will ship in 3-4 weeks)
The covers and other accessories are also available for sale and appear to be shipping.
If you are waiting for your iPad2, you can always watch Steve Jobs give the keynote for the introduction of iPad2.