I was hoping that the iPad would cooperate with your desktop, the way the MacAir will use your desktop CD Burner and share files wirelessly. And, of course, there is no USB and no SD.
It seems like Apple is trying really hard to control content on their device, by making it difficult to upload or download anything, except through the Apple Store and iTunes.
I guess what I want is a blown up Palm device, not a blown up iPhone.
No built in USB, but you can "accessorize" with an adapter for SD and USB. No multi-tasking either. If used as an eReader the UI will be harder on the eyes than a kindle.