The 4-Hour Workweek" by Timothy Ferriss. I devoured it!
It is tailored a bit to the entreprenuerial type, but it guides you through some ideas for businesses you can start. It also applies really well to employees.
Of course, my first thought was "4-hour work week" seems to good to be true, and if it seems to good to be true, then it probably is.
I am happy to say that the book changed my mind. I could even see a ton of these principles applying to GGE. Say we decided to produce our own books. Pay for PPC (pay-per-click) advertising through google to our niche group of readers. Sell our Ebooks to those readers. And make all of that automatic. Then the actual running of the business would be pretty automatic and I could just write. We could outsource things like marketing, editing and cover design. Sounds like a potential business plan. Would people buy our stuff? Well, that part is up to me I guess.