A hard drive is a hard drive is a hard drive!

While there are hard drives whose styling is created to mesh nicely with the look of a Mac, there are no Mac specific hard drives. A USB2.0 or Firewire hard drive will work with both Macs and PCs.
If your MacBook Pro supports Firewire 800, I would go for a Firewire 800 external hard drive. This is the fastest external drive you will be able to find.
Speaking of styling for Macs, I have two G-Tech G-Drives. This is a case of drive made specifically to fit in perfectly with the styling of a particular Mac. "G-Drive" was meant to sound like "G5" and the styling of the case is identical to the styling of a PowerMac G5 (and by extension, today's Mac Pro, which shares the same case styling as the PowerMac G5). The close style match is a big part of why I bought the drives - they just looked so darn good along side a PowerMac G5! Aside from good looks though, these drives also work very well and so I can recommend them. However, I am sure that pretty much any manufacturer's external drive would work equally well.
I would look for a fanless enclosure as well. This means that the drive will not make any noise except when you are actually accessing it. A noise free drive is a nice feature. Again, the G-Tech G-Drives are fan less, making them completely silent except when being accessed by the Mac.
Finally, look for a drive with as much cache as you can get. 8 MB or more is good. This will improve the subjective feel of the speed of the drive.
Good luck!