I purchased a PATA 400g Seagate 7200.8 last week from CompUSA for $229 with a $30 mail in rebate. I originally wanted the SATA version, but couldn't bring myself to pay almost twice as much.
Anyway, I installed it as the boot drive just after I bought it, replacing a Seagate 7200.7 120g model. At first, the 7200.8 was a little bit louder at idle than the 7200.8, making a slight whining sound. (BTW, my 7200.7 was absolutely the quietest drive I'd ever owned, which converted me to a Seagate man.) The seek noise of the 7200.8 seemed about the same as my 7200.7, which is to say it was minimal.
Now, a week later, the 7200.8 has lost it's whining sound altogether, and the seek noise remains the same, which is audible, but very minimal. I'm very happy with the quiet operation of the 7200.8.
I have a Shuttle system with only one fan, which is set to "Ultra low" in the BIOS. No other fans in my system, as I have a fanless video card, and no chipset fan.
My system is extremely quiet with the Seagate 7200.8, and I love it.
Hope this helps some folks.