iPad accessories shipping delays

9to5Mac has been keeping a close eye on official Apple iPad accessories [Apple Online Store link] and while the iPad dock and iPod Dock to VGA adapter remain on April 3 schedule, the iPad Case is now listed as shipping in mid April while the iPad Keyboard Dock and iPad 10W USB Power Adapter have fallen to May. What's more:

Perhaps even worse then those accessory delays is the iPad Camera Kit's current situation. The kit which allows you to connect an SD card or digital cameras to your iPad is not even on Apple's online store.

Did Apple underestimate demand for some of the iPad accessories? Did you manage to order one before the delays?