The ONLY software I have installed to Main Memory for this current setup I've got going now is the sync portion of Cash Organizer, and I've got 42 applications installed at the moment. I haven't used any of the Spb products, but I can't imagine them having trouble with storage cards.
There's a thread called "Memory Help for Noobies" that should help you figure out if a particular piece of software can be stored to storage cards. You can find it
HERE.