I think the closest thing to this that we have access to is using Amazon or Google's cloud services (particularly Amazon's because they offer machines with better GPUs). While not parallel computing, considering the insanely cheap prices those services cost, especially when you buy a discounted voucher from sites like bitcointalk....it's a very cool method until we get to the days of parallel computing.
Although, come to think of it...parallel computing might actually not be such a game changer. If you have parallel processes working on the same confirmations, the work wouldn't be segmented enough for multiple confirmations to necessarily occur faster. Single confirmations definitely, but multiple would need to use several instances...so I guess if you had several parallel machines hooked up together but with their computing power allocated across different nodes, then such power would be useful...
The increased difficulty levels in mining would accelerate dramatically if this tech were to be implemented and a great deal of miners would be put out of business or be required to spend a ton of money on new hardware...an option that might not be feasible depending on who rolls out such machines first and how aggressively they use it.
Time will tell.