things i look for nowadays
1- trials that convert at least 1:150 on TGP traffic
2- FHGs with descriptions already written and can be bulk imported into my scripts
3- incentives, more joins=more sales= more loyalty
4- good downloadable content to create my own galleries as well, along with oddsized banners etc...
5- direct to join page links
thats some of the stuff off the top of my head there