I would love to make such a switch, and am currently working on it. But that is a long-term goal, and in the meantime I'm looking to turn some time into money on the margin.
Freelancing is your best bet. Listing yourself online at places like Elance is a good start. Submit aggressive bids. Understand that feedback is CRITICAL - bad reviews can sink you, even 4 stars out of 5 is "bad", and you'll have to bid low until you have a good feedback record.
Alternately, you could do something like make an app. You probably won't make much money directly, but it could be a good longer-term investment in skills and resume.
Also, if you are considering selling some stuff you have, make an effort to shop around and get the best price. Putting it on ebay will yield higher prices than a garage sale, but take more time.
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