Well, not sure what the differences in the commands are, but I finally got the new jffs2 mounted.

Used PartEd to set Disklabel to clear my 8GB card: created a 256MB FAT32, a 4GB ext2, 3 GB ext2 and 1.2GB swap.

But I can't write anything to them! What now? I thought I saw a post somewhere about fixing a non-writable USB drive but can't seem to find it now. I guess this is more of a general Linux newbie issue.