I make a neat little side income through Mturk.com. It's a crowd sourcing site run by Amazon where you can do all manner of tasks--typing, transcription, surveys, etc. Each task is worth a set amount, typically $0.05 to $0.50. There's a bit of a learning curve and it helps if you're a fast typist and/or a quick thinker, but once you get the hang of it, those pennies add up quickly.
I just bang out tasks at night after my son goes to bed, or in the mornings when he's at school. I make about as much per week as I would working a part-time retail job. I've been doing it for 2 years and it's real money that's given me a lot more wiggle room in my budget.