Evergreen USB Mini Trackball
I'd wager there's a special place in all of our hearts for tiny peripherals, and this Evergreen USB Mini Trackball certainly takes miniaturization seriously. A blocky 30 x 30 x 20mm, with a retractable USB cord, the trackball fits in both left and right mouse buttons and a scroll button on its top side.
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Underneath there's a tiny middle mouse key, which can be jabbed at with a serious press of the index finger. The whole thing weighs just 22g, yet promises 800dpi resolution.
The cord extends to a maximum 70cm and the trackball is compatible with Windows XP and Vista. It's available in Japan for the equivalent of around $20, which seems a bit of a bargain for those people who don't like travel mice.
[via OhGizmo!]