Try this adapter, you can plug it into the Xoom and use the cable for your camera to transfer photos.
Amazon.com: USB Micro B (M) to USB A (F) Adapter - Converts USB Micro B Devices to Full Size USB A!: Electronics
I haven't tried it, but it looks like it would work.
Hack is out to let you pull from external hard drives with the usb.
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Could you be more specific...what hack? Where? Could you provide a URL?
Thanks.