Are you high?
On a related note, it's great to be able to buy weed with Bitcoins over the net, but what if you could actually SEND WEED OVER THE BLOCKCHAIN?! Whoa, man. Like. Whoa.
Lol. Nope.
There are already groups trying to create coins that essentially "rent out" the computing power of the network. Why not dedicate the computing power to something huge? Yeah it's a sci-fi wet dream that probably won't ever happen, but a man can dream.
It's not too crazy. Put up a password hash you want to hack, and let the bitcoin network brute-force it for you! Whoever figures it out gets the coins
I can only really think of dubious uses for this It seems like it would only really work with tasks that use many computers to work on one single, small piece of data. Things like SETI (from what I understand) require each computer to receive a unique problem and need a centralized server to coordinate it all. Sending out a unique problem for every computer on the network, to every computer on the network through the blockchain would be extremely inefficient...