we are looking for beta testers for our new SEO tool http://www.backlinktracker.com. If you are interested, feel free to sign up. The app is not quite completed but main features are working. We are still developing it. As beta testers you will be allowed to use this tool for free the all time. Please, contact me, if you have some questions, suggestions or want to cooperate with us. Thanks.
Yes, it is simple. You only have to set up bought/sold backlinks and if something is changed (link is removed from a site, pagerank is changed, ...) you will be notified via e-mail.
NIce, can your tool handle large sites easily?