Yes, sometimes I get numbness in my hands. When it happens I've tensed my shoulders up to my ears. When I notice this I relax my shoulders, move my hands and it goes away.

I also get numbness in my right foot but it is because I have a bad habit of pushing down on the pedal when I'm coasting. After a period of time my foot starts talking to me.

Insoles in most cycling shoes are useless. I just got ESoles. I've used some sort of orthotics for years and they really help the hot spots.