WordPress.org

=Does this plugin add any database tables?=

No. The link and a small bit of associated data is appended to the comment content at the time of submission

=Will this plugin work with Disqus/Intense Debate/js-kit?=

There will be versions in the future that will work with Disqus, JS-kit and Intense debate. There is also an API available for developers if they choose to write their own versions.

=I am having a problem getting it to work=

You can submit a support ticket at http://comluv.com