I would add another opportunity with house parties -- show people energy monitors, ideally in action (if you can swing it).  I had a meeting with a local green group a few weeks back, and brough a bag full of monitors (true, I happen to have 'em lying around in heaps, but that's mostly a side effect of working at EC :-).

This could also be a great side business (one we're working on facilitating for our EC PRO customers right now) -- some energy efficiency products are a little tricky for the average homeowner to install, so maybe a good incentive for a person hosting a house party would be free installation of a TED 5000 or other monitor.

A lot of saving energy is invisible -- as the saying goes, "out of site is out of mind" -- Peter's list of marketing ideas are all just ways to keep reminding folks of the benefits of the services you provide.  Having some sort of visual aspect, or measurement tool can really help sink home the idea that an efficient house is a continual process.