You make money with your side projects? :O
The most my company would get are some CSS drawings, some small web apps, and a bunch of fake Internet points.
I used to do some consulting with a partner who had created some business-specific applications. So I helped with that and sometimes was paid to consult or a portion of sales for what I developed. Side work with no big money involved. In fact, I don't like having side work obligations on my free time, so I have endeavored to transfer that work to other interested parties. I mostly get into side projects because people ask for my help.
The few things I developed on my own, like a Chess simulator or my personal finances simulator are not really sale-able as they are. So, those don't make any money at all. I started them to satisfy my own curiosity anyway.
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