I am looking for a Web annotation site that does not require a plugin, as most such tools do. I am thinking of a website in which you can create an account and then annotate arbitrary websites, without the copyright issues involved in copying their content.
Other users can browse to your account in the annotation site and see the marked-up pages (e.g. in an IFRAME) along with your comments.
I don't mind installing a plugin myself, but those who browse to my account should be able to do that without any installation.
If this annotation tool has some super-convenient way to embed it in my own website, all the better, but I don't mind linking out to it.