I've written up a couple of pieces for The Register (I can put in links if anyone wants) around this topic. The Register is not terribly renewables-friendly by default, and a lot of the the comments are of the form "but what's the point, what's the payback period?" (a question they never ask about their latest 600W plasma TV or SUV of course), but some people do understand the "it's fun to generate your own energy" and "I might now be part of the solution" drivers.
Plus your house and grounds are enviable just on looks alone... B^>
Rgds
Damon