Why not just look in your web stats as to who has sent you TRAFFIC? Knowing who has a link to you doesn't really do you any good if no one is clicking those links. Just because a site links to you doesn't mean they deserve a link back - only link back to sites that send you traffic. You can see those in your stats.
Thank you. I agree getting traffic is good. But is not the only reason to want a link from another site. Popularity helps so I trade happily links with good PR sites and pages even if they don't send me traffic. Probably they will not bring me traffic EVER, but their links help me rank and get the traffic form where I want to.
You can't see that in logs. BTW still need a good spider or link checker able to detect where they are linking or not. Not only based on SE indexed results... Any others! :)