I don't know how long it's been available (obviously not very), but Western Digital now sells a 500GB version of the Scorpio Black, the WD5000BEKT. I'm not desperate to try it myself, but I thought others might be interested in buying this drive and testing it out since I know we have a lot of Western Digital fans here. If anyone does buy this drive feel free to post your thoughts here.
http://wdc.com/en/products/products.asp?driveid=854
http://www.google.com/products?q=WD5000BEKT&hl=en&aq=f
http://wdc.com/en/products/products.asp?driveid=854
http://www.google.com/products?q=WD5000BEKT&hl=en&aq=f