Thanks Nemanracing -- I just ordered the
SanDisk 4 GB Extreme III SDHC Card with MicroMate USB 2.0 Reader (SDSDRX3-4096-A21) - SanDisk
In Stock
Shipped from: J&R Music and Computer World
$59.99

on Amazon.

(Now to wait for the Sch-i760 release to be able to try it!)