There's a deb for cloning the OS to a memory card:
http://www.internettablettalk.com/fo...ht=cloning+deb
i'm not that great in unix either. i'm still too scared to try dual-booting, but if i ever do it, i'd probably use that deb. looks pretty easy.

EDIT: if you want OS2008 on MMC and OS2007 on the device memory, i'm not sure how helpful the deb is, after all. maybe someone else can be of more help....