Have you tried using a CF multi-adapter?  They are not very expensive, I paid $30 for one that runs SD, MMC, Sony, Sony Pro and even a Smart memory slot into CF.  Works perfectly for loading my daughter's Sony stick onto the P2000.  Might work for larger SD cards too since it looks like a CF card to the device.

I recently learned the hard way that the (otherwise fabulous) Epson P-2000 doesn't support SD cards larger than 1 GB, namely my new Sandisk Ultra II 2 GB SD-card. It's in the manual and on the website, so I could have known before, but not in my wildest dreams I would have thought of such a silly limitation.
I post this here as I bought the P-2000 because of its review on this site and I guess sooner or later somebody else may run into this...
Christoph