IOGEAR mouse has 32MB of memory: I don’t quite understand the point, but it’s neat. For Macs only.
“IOGEAR has launched Memory Mouse, a mini mouse that can store files up to 32MB using flash memory. It’s compatible with Mac OS X. ‘The Memory Mouse appears on your desktop as a drive and is drag and drop,’ IOGEAR representative Noah Dye told MacCentral.”