It's not mine, it's a project of one of the guys in my area. Embed a tiny little tab on your site, and users can easily send you feedback about problems with your site. His software automatically collects information about the user's browser, environment, and configuration, saving you the hassle of trying to figure all that out on your own.

He's done a really nice job on it. We ended up using it on the site for our recent hackathon, and found it was also an easy way to post a quick message to the webmaster about an update.