If you're interested in maintenance, read Mike Busch's "Savvy Aviator" articles on Avweb. Aside from the guy's hair in his bio photo, I'd have to say it's some of the best maintenance-related information I've ever found. He's definitely living the dream - he owns, maintains, and flies his own C310, and he can write the whole thing off as a business expense. That has to be the most beautiful thing I've ever heard.
I've only recently discovered the Savvy Aviator stuff, but it's on the money and I think it would have saved me a lot of time when I started getting my feet wet in the repair/improvement/maintenance of my C140. As an engineer and life-long wrench turner, I'm definitely a future A&P/IA. The time I've spent working on the 140 has been some of the most enjoyable I've experienced in aviation.
BTW, can anyone recommend any other good maintenance-related reading and educational materials?