My original post was meant to say that aren't there other ASICs already designed by someone else that can do these same types of computations.
There has been some talk of upcoming "crypto chips", meant for use in mobile phones, being used for mining.
While their design will surely prioritize performance-per-watt highly, it will probably not prioritize absolute performance very highly at all. (How much sha256 crunching will a mobile phone need to do, really?)
So, I think that any "miner product" that uses these chips will probably have to incorporate a heck of a lot of them in order for it to add up to any kind of substantial hashrate, which will make for a complex PCB, complex cooling, and such.