Post Loop is good if you pass their strict validation process they turn away more people then they accept but i have heard only good things about the owner, plus they are adding blog commenting to the system as well.
I have to agree with Savvy, it is quite a good service, also the introduction/acceptance program isn't that hard, you just have to have good grammar, sentence structure and length.
I love PostLoop. I have used it both as a forum owner and a content writer and it has been really good for me. I prefer it as a content writer to be honest because of the fact that they are not as strict as some of the other automated post exchange sites. Because of that some of the other users are not that great when they write content which isn't good if you are a forum owner looking for good quality content.
Postloop should be tailored to the exact traffic you want. For instance, some owners are strict on grammar and whatnot, and some aren't. Also, there could be a case where owners have to raise the rating, not because of quality, but because there are too many writers for the given budget. However, though, I think it's always cool to have a big budget so many people can get paid - but I can see why that's not possible for some.
