Checked out an 8GB SDHC card and it is working without issue.

(06:42:36 PM) jonsmirl: root@phyCORE-MPC5200B-tiny:~ df -h
Filesystem Size Used Available Use% Mounted on
none 30.0M 0 30.0M 0% /tmp
none 30.0M 20.0k 29.9M 0% /var/log
none 30.0M 16.0k 29.9M 0% /var/run
none 30.0M 0 30.0M 0% /var/lock
tmpfs 30.0M 8.0k 30.0M 0% /dev
/dev/mmcblk0p1 7.6G 32.0k 7.6G 0% /mnt
root@phyCORE-MPC5200B-tiny:~

dmesg...
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDHC card on SPI
mmcblk0: mmc0:0000 SD08G 8003584KiB
mmcblk0: p1

Formatting it FAT32 (for compatibility) eats 400MB.
I bought the card for $21 shipped.

Typical home would use 6-10 Digispeakers, that's 80GB storage capacity. All of it fast and silent. 16GB ($48) cards work too. I see a 32GB one for $130 now.

The cards are user installable. In three years 32GB cards will be $20. Prices on these cards are going way down due to their use in camcorders.

I'm still sorting out the interrupt handlers for IR. I hope to get it working soon.