It's about time someone produced one of these: a CF card reader for iPad and iPad 2. It also includes a USB port, although I'm not sure what you can do with that. Maybe connect a second camera?
I just placed an order with the M.I.C. Store (stands for made in China, I believe). The item cost $29.90 plus shipping for a total cost of $36.50 US. It will be a couple weeks before I receive it. I'll let you know how it goes.