I've been wandering the forum the last few days and came across this thread so I wanted to chime in with the intial blog that got me interested in microhydro. A guy named Manfred Mornhinweg down in South America (Chile I think) posted a great series of pictures of his microhydro install. It definitely looks like he has plenty of head, but the interesting part is that he's also excellent with electronics and includes schematics and code for a microcontroller-based power regulator that he's using for his system. So if you someone does have any experience with a soldering iron, or wants to learn, you don't have to invent any wheels. The thread that covers the microhydro install is here:
http://ludens.cl/paradise/turbine/turbine.html he also talks about how he's divided up the circuits in his home, etc. Obviously the building code/environmental regulations wherever he is are a lot less strict than we generally have to deal with in the states but there is plenty of good information in there.