I used to have Jumsoft's Money on my MBP, but I got rid of it a while back... but now in my MobileMe sync PrefPane there's an orphaned entry in there for Money:
I'm just guessing here, but....
Did you used to sync Money to iDisk when you used that app? Perhaps if you deleted the Money backups from iDisk it would go away.
Otherwise it's there because there are still remnants of that app in your computer. Any idea if this is the case?