Maybe an offline app with the parts database built in. I know I would personally love that.
Why offline ? Updating the database would be more trouble and the price checker wouldn't work as good since it wouldn't be updated as often. Just my 2 cents
Yeah but it could use the Internet when available. Some people travel alot and can't use Internet as often (roaming, data loss, etc), being able to put together a part list for a friend would be really nice.
Even if it requires a 2.00$ a month for the "full" version.