[switch33]

I'm surprised no one mentioned investing. You can make decent money from investing if you have the time to do the research.

And an understanding of how accounting/finance is better than being to do all the math since many of the stock information websites help you out with any kind of information you want to know.

Also using programming you can grab data from sites using Yahoo API or other APIs or simply webscraping(if they allow it) and produce your own tests on market information to prune information for resulting trades.