Anyhoo, thought I might share some of the apps I've found which have been useful for school, one way or another, so if you have or come to acquire a smartphone with app potential you might have some places to start or new apps to explore.
The US version of this seems to have greater functionality than the Australian one as yet - a number of the reviews comment on the gaps in Australian sources/sites/pricing for goods. You can scan pretty much any barcode and if the app finds a match, it will show details of that product and sources for it (but given the limited Australian functionality I'd be checking prices at other known suppliers rather than relying on the app). Books probably have a better hit rate than some other goods, as they are generally internationally available.
Still, it has served a useful libraryish purpose over the hols, and I'm sure I'll find more ways to use it. Be nice if those price check machines in stores worked as efficiently and quickly...