With my first service based online business making just over that magical $1000 mark I decided to write up my experiances so far. If your intrested you can find them at blogstew.com
Should make for an intresting read if your looking to get into this type of thing. I'm by no means an expert, but I can say this:
Running this type of site really has been an eye opener to just how much money you can make online if you put your mind to it.