If you guys want a quiet and cool 500GB SATA HD. The Samsung HD501LJ is on sale for $99.99 free shiped at Zipzoomfly.
link
I think this and the WD are very highly regarded by silentpcreview, but it's $10 more than this Maxtor deal.
Only thing, is some people have complained about the way ZZF packages their OEM drives for shipping, not much padding. Don't know if it's still true currently. I'm still waiting for this drive to drop a couple of dollars more.
Acoustic management has been disabled on the Maxtor/Seagate HDs since like the 7200.7 series. All the SATA version are set to performance mode, and the PATA ones should be set to quiet. This makes me hesitant to buy a Seagate SATA HD. I think they might have quieten down the HDs for the 7200.11 series, though.
Anandtech review on the Samsung HD:
Samsung SpinPoint T166 500GB: Cool, Quiet, and Quick
Acoustics and Thermals on page 5.