Just an update regarding TextLinkBrokers. I have just received a payment from them for their paid directory program.
TextLinkBrokers new affiliate manager called me last week to talk to me about helping them gain exposure. They sounded pretty legit from what I heard.
From what I have been told they did the backlinking for wikipedia. Send them an email asking who their clients are. They look legit to me.
We used them a couple years back for a client. Purchased links ranging from PR 2 to 7 and got a nice PR jump as well as SERP boost. Unfortunately the client ran out of budget for this. I would use them if necessary.