If you're looking for a drive that's big on storage, but small in size, look no further than Fujitsu's 300GB 2.5-inch portable drive.
The drive spins up at 4200rmp, so don't expect it to be the fastest little drive out there, but it is the largest capacity 2.5-inch drive to date. If you have a tendancy to drop things, its 16-point omnidirectional shock mound design should keep your data save in the event of a fall.
You can pick up one of these now for $229, a 5400prm 120GB drive is due to be released later this year for $129.
Fujitsu 2.5-inch Portable 300GB Hard Drive [via mobilewhack]