w/ the version Umikaze 2.1.1 (based on Ubuntu), use echo ,+ | sudo fsdisk --no-reread -N 1 /dev/mmcblk0
after you reboot, use sudo resize2fs /dev/mmcblk0p1
This should give you some idea on how to grow your partition to its full capabilities. This was taught to me tonight by a person. If this person wants credit, this person will step forward.
P.S. Geaux Cajuns!