It looks like Class 4 32GB sdcards are pretty common, but newegg also has a good price on a class 10. Which will actually work on the Xoom?
More importantly, I see all sorts of posts about sticking ext3 or ext4 on the sdcard. Sticking a journaling filesystem on flash memory doesn't seem like a wise move to me. SDCards, like all flash based memory, have a finite amount of writes available before they are toast. Journaling filesystems (such as ext3 and ext4) constantly write out their journals, which make them bad candidates for filesystems on flash memory and tend to journal the flash memory to death. Ext2, or FAT even, seem to be much better candidates -- any thoughts here?