I recently got an online subscription (not printed edition) to
Home Power Magazine. I have to say, it is so worth the tiny subscription fee ($10/year). The online subscription gives you access to all their back articles online. They have articles on tons of stuff: solar hot water, pv, microhydro, building/design, electric vehicles, and just general home efficiency. If anyone is looking for a wealth of info on renewable energy and home power in general this is a great way to go IMO.