I've bought 1Gb SD card and create two partitions on it: first FAT32 for exchange between other devices (digical camera and wife's Zire72) and second Ext3 for installing zaurus programs and documents.
Also I've mkdir /mnt/sd and changed the /etc/fstab as follows:
/dev/mmcd/disc0/part1 /mnt/sd auto noauto,owner 0 0
/dev/mmcd/disc0/part2 /mnt/card auto noauto,owner 0 0
After restarting, I expect, that /mnt/sd will contain FAT32 and /mnt/card ext3. But, in fact, all remains as in usual: /mnt/card is FAT32 and /mnt/sd is not mounted.