I think it is HP that is making molecular computers. It works using "molecule binary". This is when a molecule can be in 1 of 2 states.
Something like this could make very small computers and also enough storage for......a LOT of stuff. Radioactivity might not be such a good idea around a molecular computer though...xD
I don't see a major shift happening in computer technology such as that one for a very long time.
But they are already researching it. It won't be mainstream for maybe....5 years...