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Blue Microphones Mikey (Creative, Under $100)

For those who like to get creative with sound, Blue Mikey ($79.99) is an excellent addition to your potable digital tool belt. Essentially a mic that plugs into the bottom of your iPhone or iPod, Mikey lets you capture anything from live music to lectures. You interface with the hardware as you would the iPhone's built-in mic; you can either use Apple's own voice recorder, or download some more feature-packed options as Fire and FourTrack. Since it uses your iPhone as its "computer," the Blue Mikey is infinitely smaller than most digital recorders out there (for better or worse, it's also very light). The mic is directional, and a switch on the back lets you choose between different gain levels, depending on the sound source. Field recording has never been so convenient.