Smart: utility software linked to a hardware device. The Migo is a $150 128MB USB chipdisk. That's about a $100 premium over what at first glance appears to be a similar device. But the Migo has a custom driver that grabs your Outlook settings, your Favorites folder, etc. Now, let's just say that you wrote a utility program that allows you to zip up your /Local Settings folder and carry it around with you. Think you could sell it for $100 and say "Just use it with your $50 chipdisk"? Of course not. You might get a handful of registrations if you made it $30 shareware. But probably not.

That's why it's a good idea to learn about .NET Compact Framework and SPOT.