The iPad really is a giant iPhone - so much so that if you want to get a laptop-like experience out of it, you'll need adaptors to change the typical 30-pin connector into USB, SD or AC power.
In addition to the keyboard attachment, there will also be dongles, attaching to the 30-pin dock connector, that give a USB port and SD card slot. In terms of charging, there's no built-in MagSafe connector or anything, so they'll also be shipping a USB-to-AC cable as an optional extra. Neither release date nor pricing has been revealed on these accessories, but we'll let you know as soon as we have them. [Official Page, Our Apple iPad Coverage]