I can easily say that Postloop is the best paid posting site, and one of the best money making opportunities out there (if you are into that sort of thing).
At Postloop, forum/blog owners can get posts to their blogs or forums for free (by posting at other blogs or forums) and content writers can simply earn some good cash.
It is a points based system there, and you get paid approximately 8 cents per post, if not more (depends on your user rating). There has been a lot of skepticism regarding the high payment. It pays so well because it requires you to post in good English grammar and also, format your posts.
You can withdraw your money after you have a 100 points (easily achievable within a few hours, if not minutes!), and all payments are dispatched via PayPal.
Here's where you can join the site:
Let me know how it goes, and also, if you need any help.
And oh yes, I have been paid multiple times. Here are a few of my recent payments from the site: