Dryden on 01 December 2008
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136314
500Gb WD Scorpio Blue $114.99 w/ free shipping.
Faster AND cooler.
You should be very cautious about putting a 7200rpm+ drive in the PS3; the higher spindle speed generates A LOT more heat.