For $16, you can get USB access on your transformer without the keyboard dock:
ASUS Transformer TF101 USB Kit. ASUS 90-OK06CR00010
ASUS Transformer TF101 USB Kit. ASUS 90-OK06CR00010
Question: Does the adapter have a retractable cable or does it only plug directly into the charging port?
I ask because the charging port is on the underside of the device, which would mean that the USB adapter can really only be used while the tablet is laying or being held in a prone position.
Impact being, if you have the table sitting upright in a stand as I often do, you can't have the USB adapter plugged in an be using a usb keyboard or etc.