Western Digital's My Passport Studio external HDDs
But Western Digital's My Passport Studio brand of portable hard drives are actually something I can use. Advertised as "Mac-ready storage to go," these diminuitive drives are little larger than a set of car keys and come in sizes up to 320GB. But hey, they managed to fit in both USB and Firewire connections into the thing. Self-powering USB and Firewire connections, no less. And it's even Time Machine ready.
I could actually use this. My first Gen MacBook Pro has a tiny 80GB hard drive. My iTunes library, on the other hand, is 300GB, meaning I never have my music or videos with me when I'm on the road. Amazingly, this might be just what I am looking for. Even better, a chance to burst the hymen of my MBP's dusty, shriveled and completely unused FireWire port. Neat.
My Passport Studio [Western Digital]

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One strange design choice for this:
"Capacity Gauge - Connect My Passport to your computer and see at a glance how much space is available on your drive."
This would be great if it worked without plugging in (some kind of bistable indicator?), but if I connect it to a Mac, it is trivially easy to see capacity remaining through the OS.
'time machine ready'? Doesn't time machine work with any internal/external drive?
"burst the hymen of my MBP's dusty, shriveled and completely unused FireWire port."
ew. okay, you win.
"...these diminutive drives are little larger than a set of car keys..."
3 by 5 by 0.7 inches, someone has some giant car keys!