Momentus 7200.4
Seagate has announced a 7200rpm 500gb 2.5" notebook hard drive. Assuming they didn't break the form factor (as some other 500gb notebook drives have done, using 3 platters but making a drive that's slightly taller than the form factor allows), this will be a nice update for the 160gb drive in my MacBook Pro.
There are 5400rpm drives, like the Western Digital Scorpio Blue, but the Seagate spins faster, and has a bigger cache. No doubt it will cost more, too.
I don't much like the new MacBook Pro's, but the hard drive upgradeability they offer is nice. The computer I have requires some delicate surgery to upgrade the drive.
(And in case you missed it in that first link - they also have a 1.5 terabyte 3.5" drive. Wow!)