Related to The Cost of Bulk Storage posting, Mike Neil dropped me a note. He's built an array based upon this Western Digital part: http://www.wdc.com/en/products/Products.asp?DriveID=336.  Its unusually power efficient:

And it’s currently only $105: http://www.newegg.com/Product/Product.aspx?Item=N82E16822136151. 

It’s always been the case that home storage is wildly cheaper than data center hosted storage.  What excites me even more than the continued plunging cost of raw storage is that data center hosted storage is asymptotically approaching the home storage cost . Data center storage includes someone else doing capacity planning and buying new equipment when needed, someone else replacing failed disks and servers and, in the case of S3, it’s geo-redundant (data is stored in multiple data centers).

I’ve not yet discarded my multi-TB home storage system yet but the time is near.

                                                                --jrh