Annotation is an interesting idea. I've seen other ideas to annotate web pages out there, but never one that really caught on to my knowledge (maybe because they required a browser plug-in to see or create the annotations), and they also allowed you to annotate anyone's site with or without their permission.
What if as an option you allowed other sites to install an "annotate my site" script you provided, which acts as a lead-in to direct people back to your site with a link or with a "find other pages like this" type of thing? You could even provide a cross-reference between annotated sites this way, and provide a centralized site sort of like a directory of these sites...
What aneesh and yourself are saying is coming eerily close to discussions we've been having recently... thanks for the feedback guys, very much appreciated!
What if as an option you allowed other sites to install an "annotate my site" script you provided, which acts as a lead-in to direct people back to your site with a link or with a "find other pages like this" type of thing? You could even provide a cross-reference between annotated sites this way, and provide a centralized site sort of like a directory of these sites...