I have just completed a (forced) upgrade to my Macbook Pro with a 320GB Seagate (ST9320320AS). “Forced” simply because I woke up this morning turned on my mac and suddenly heard a load of clicking sounds!
I can confirm that this model of drive is compatible with the Macs and was actually a little quicker than the original hard drive.
Links I found useful:
It’s quite easy to do but it does involve over 20 screws being undone!