This thread's information is muddy and inaccurate at best. Let me clarify.
The iPad has one (1) singular dock connector and includes a USB cable. One end is the 30-pin dock connector which plugs in the iPad and the other end is USB 2.0 which plugs into your computer. You need iTunes on your computer to transfer music, video, photos, etc. The iPad is also an iPod. Any iPhone apps you currently can be synced and will run on the iPad with no modifications. All music, videos, photos are synced to the iPad using that USB cable using iTunes. To iTunes, it's just another iPod.
You can buy the iPad camera connection kit. I don't know how it costs yet. It comes with 2 little adapters. One acts as an SD card reader, the other a USB port. Picture below.
The one on the left is a female USB port. The one on the right is an SD card reader. Both adapters plug into the iPad's dock connector.