Recently, at the request of faculty and staff here in the College of Arts and Sciences at The University of Alabama, eTech hosted an iPad accessory showcase, gathering an assortment of keyboards, styli, various cables, and even some drumsticks and a guitar pick, so that faculty and staff who have iPads might take these on a test drive before purchasing their own. The list below shows the items in the showcase. I have linked the items to pages on the Logitech, Zagg, etc., websites, or in a couple of cases to a page on Amazon. Do know that prices may vary, so you may want to shop around rather than purchasing directly from the company that made the item.
Targus stylus (the Targus stylus in our showcase, the one with the wide, angled tip, seems to no longer be available, the link in the text is to a page showing other Targus styli)
The following four items are all Apple products and can be found on this page: iPad accessories
VGA display connector
iPad dock (when used in a multimedia room, this dock seems to distort the mirrored image from the iPad)
Apple digital AV adapter
camera kit connection