I'm new at C-rigging and was wondering how fast a retrreive to use.  I read somewhere to retreive it like a crank bait but it doesn't feel right to me.  My instincts tell me to slow way down and work it back like a weightless senko.  What are your opinions?

Like a Senko is a pretty good description -- use a sweeping motion to the side with your rod and then pause to let the lure settle down before sweeping again.  Keep a fairly tight line on your main line so that you can feel the strikes and then use a sweeping hookset.

I've used Shad-Master's method more than others.  I've read articles that suggest a medium retrieval speed also.  

What Shad Master said !

Thanks for the input - isn't this forum great for learning about fishing?