I have no idea how useful all those USB desktop vacuums are, can't imagine they have much power to them, but I don't think I can resist this retro-style USB vacuum, which mimics the look of an old classic upright. While I don't see the dimensions listed, I imagine it's like most USB vacuums and is about the size of a standard stapler. It probably has just enough suction power to clean up lunch crumbs that you (well, I) would normally just brush off onto the floor. It might possibly also lessen my earth-destroying habit of using canned air on everything. I'm not sure this vacuum could actually get at the bits of grossness that get stuck in keyboards, but it would sure look cute trying.

The retro USB vacuum is $34, and available from Bim Bam Banana.