It appears that quantum computers could prove to be more useful than many people have previously thought:
OK, great...now where is this machine? It seems that no one has really successfully built a true quantum computer. I'm starting to think that we're thinking of problems we could potentially solve on a machine that has yet to fully exist.
Well, the truth of the matter is that computing models (Turing machine, Markov model, Parallel machines) have always preceded actual computing machinery. After all, who is going to invest the time and money into developing a machine when it isn't clear what the machine will be able to perform?
Regarding quantum computers, there is actually a pretty interesting debate/discussion (I'm not sure what to call it at this point) regarding D-Wave, a handful of well-known theorists, and now Google. Things are getting interesting... I just haven't had a chance to post it.