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If a full charging pack is more than you need, consider "Juice Buddy" -- a lightweight, travel-friendly charger for mobile devices.
It's small enough to fit on your keychain, and you can charge one device at a time through a USB port. The Juice Buddy is compatible with all Apple devices, including the iPhone, iPod Touch and iPad.
Via: Arriba Design
Sony ICDBX132 BX Series 2GB Voice Recorder
When students first appear for their lecture, a common sight is the deposit of dictaphones on the professor's desk. Not only useful to check your notes and for revision purposes, a dictaphone can also be used to give you an audial record of your own notes.
Sony's ICDBX132 BX series 2GB voice recorder is a good bet for a decent price -- and comes with 16 hours of battery life and built-in speakers.
Price: £29.99 ($46)
Seagate GoFlex Slim 320GB external hard drive for Mac
An external hard drive is a popular choice to back up essays, coursework, photos and music. Desktop and portable variants have flooded the market, ranging from storage options of 250GB to 1.5TB. The Seagate GoFlex Slim 320GB external hard drive is a reasonably priced option for a slim, small drive to back up work.