There are also CF to SD adapters (I've been seeing
them in my trolling on
eBay today). There are also the CF form-factor microdrives, but those are
getting scarce too I suspect.
Find a friend with an old iPod and offer to exchange his hard disk for a
CF card. I did it on mine, upgraded to 8GB and I'm looking to upgrade it to
16GB
(ok. I don't use it. But my daughter loves it :o))