It's actually a .net domain. Linkmarket is very good IMO. You have the ability to check out the other site before you accept an exchange. I built up around 20 requests for link exchange in a week.
I have an account with the linkmarket.net and .com. For the ordinary users, the restrictions are as usual for any other link exchange site (like request from PR 0 sites, content varying from yours etc). The paid members enjoy certain benefits. Apart from this, it is just similar to other programs
I signed up for an account last night and I'm already getting requests from others. Like you said dairy, most are PR 0. I'm wondering if this is going to get annoying. Lol. Thanks for your feedback fellas.