I had a reply all put together in my head and before I finished scrolling the posts Kristian stole my thunder.
Excellent advice re: making money on TGP submits. That's just exactly what I do, post to smaller niche specfic TGP's, including my own.
I find additional TGP's to submit to two ways. I look to see who the sites I submit to are trading traffic with, then go to see if those sites may be worthy of a few test submits. I also keep an eye on the recips on galleries posted on those sites, and on the galleries submitted to my TGP sites.
I'm not getting rich by any stretch of the imagination, but I am earning more than I did at my last full time job working for someone else.