Gibeo is an social networked annotation service. At any website you can select some text, label it (important, wrong, comment) and add your comment to it. Other people can do something similar and you can see their comments and annotation as well. And you can add comments to their annotations. By entering the url of the website you want to comment on and add gibeo.net to it, you have enabled the annotation service.
I think that this is not the first incarnation of such a service. I guess the other did not make it. A problem with such a service is the quality of the comments and the granularity of the labels (starts at 3 letters). It is interesting to know whether people have comments on a certain webpage. But I doubt that this is the way to go. What about a trackback kind of thing? Have a link on a page that shows the trackbacks to that page or site. Then you are referred to the weblog that has the comments. Ordering of trackbacks can then be made by some popularity measure. I find annotation support an interesting service, however we still wait for the right implementation. Gibeo has a lot of interesting ingredients and might provide inspiration for others. I will try to add this entry to Gibeo.
[inspiration: The Social Software weblog]