As far as online writing goes, I get a lot of work through private clients. I do some writing for content studios -- it's always wise to have several income streams when you're a freelancer. The one that pays the best is Constant Content, although you often wait for months for a piece to sell. I get a reasonable amount of income through the UK version of Textbroker; they don't pay brilliantly, but they're better than some and fairly reliable. I also do a little work for Hirewriters and iWriter; the pay is fiddling, but if you just write a quick article now and again you can make a little extra cash.