Some Web annotations links

Web annotations help collaborating users to create and read comments in the 
context of the documents. Annotea is a metadata based annotation framework 
that uses W3C standards as much as possible. So the annotation information 
is readily available for different kinds of clients. Here is a link to 
Annotea project home page.

http://www.w3.org/2001/Annotea/

And one of the earlier Annotea papers:

http://www.w3.org/2001/Annotea/Papers/www10/annotea-www10.html

annoChump is one client that uses Annotea annotations server in the context 
of IRC for documenting URI's

http://www.w3.org/2001/09/chump/

Also EARL evaluations can be thought as annotations with a different 
schema. Here is
EARL 1.0 Specification

  http://infomesh.net/2001/earl1.0/

Marja