The iPad 2 is scheduled to be released at 5pm Friday March 11th at the Apple Store. But I've also seen that Best Buy may also have the ipad 2 available at launch on Friday March 11th. No details are available on the time of the Best Buy launch but I would assume that its also 5pm.
If I had plenty of free time, no job and unlimited funds, it might be fun to camp out at my local Apple store. However, I have none of those so I plan on pre-ordering the iPad 2 on Friday as soon as it becomes available online.