Sorry - lol<quoted text>
Gah, I almost answered all these in a post, took me about 5 minutes to pull back into human thought mode. lol
Analogue computers, we need to explore that option so much right now, binary is just not as capable, imagine an analogue computing system using the speeds we have today. Instead of measuring in Ghz, we'd have to measure phones in Thz.
I only know of historical analogue computers but I imagine the technology is now available (or soon will be with adequate noise reduction) to take the analogue computer into the future. I suppose it would be a completely different concept of and usage of computing power.