Tip of the hat to Deb at 8 Hours and Lunch for making me aware of Marci Alboher's One Person/Multiple Careers, referring to what she calls "slash careers". Marci's take is that many professionals currently working the single job grind can gain fuller career satisfaction by weaving multiple careers together. As Deb puts it, the "I'm a training consultant/teacher/writer/photographer" or "I'm a training consultant/Broadway singer".
By putting together these types of Slash Careers, the theory is that you can make a living, but be more satisfied since you will be doing the things that really motivate you from a content standpoint. I'm going to buy the book, as I think everyone with more than one primary interest in life often thinks of this type of arrangement, which I have also heard framed as the "portfolio career".
Of course you still have to pay the bills. With this in mind, there is never a better time to start a slash career than when you are fully employed. Doing the side gig allows you to experiment with limited risk, and also allows you the freedom to volunteer your services in the targeted slash area to build a portfolio and gain experience in the area.
Check out the blog for the book here, and keep the concept in mind - their are a million possibilities and combinations - you just have to find the right one for you....