ITRS Emerging Research Devices
I was reading George Bourianoff's The Future of Nanocomputing, from IEEE Computer, and it led me to a section of one of my favorite references, the 2005 edition of International Technology Roadmap for Semiconductors, titled "Emerging Research Devices". 200+ references on carbon nanotubes, quantum cellular automata, etc. -- numerous alternatives to standard CMOS for achieving classical computation. On quantum computing, which it calls "coherence quantum computing" to differentiate it from classical computing performed with quantum effects, it defers to the ARDA Quantum Information Science and Technology Roadmap. All worth a look.