Annotation software is not primarily for scholarly editing but rather for group collaboration with contributors separated by space or time. Some versions are electronic "Post-Its" in which overlays are added to the transmission of pages without altering the original.

W3C Collaboration Group alas link to annotation group is pffft!
<http://www.w3.org/Collaboration/>

Annotation Engine with test Harvard Law (Berkman Center)
<http://cyber.law.harvard.edu/projects/annotate.html>

Jon Garfunkel, Web Annotation Technologies Ten examples with links
<http://look.boston.ma.us/garf/webdev/annote/software.html>

Lingistic annotation Resources (mostly for speech) include a few for text
<http://www.ldc.upenn.edu/annotation/>

CoNote (Cornell) Shared student annotation system, with bibliography
<http://www.ascusc.org/jcmc/vol4/issue3/gay.html>

European Commission on Electronic Publishing Web Based Tools For Document Annotation -- see Zip
<http://www.elpub.org/html/tool_annot.html#>
|| See EC Electronic Publishing Main page http://www.elpub.org/
|| See CoNote tests at http://collaborate.elpub.org/.

Collaboration on the Net (1995) MOO potentials
<http://tecfa.unige.ch/tecfa/research/CMC/andrea95/node8.html>

Annotation technology (1999) Demo available
<http://www-hbp.usc.edu/Projects/annotati.htm>

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John Unser's Inote Image annotation in Java
<http://www.iath.virginia.edu/inote/>

Blake project to include multimedia annotation software
<http://www.intelligent-agent.com/spring_blake.html>

imarkup Web stickies
<http://www.imarkup.com>

Thirdvoice requires plugin
<http://www.thirdvoice.com>

Say No To Third Voice movement
<http://www.saynotothirdvoice.com/whats-new.html>

Web Grafitti UKHackers v. Third Voice
<http://www.ukhackers.com/archive/200999.html>

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Tools for The Psychology of Cyberspace book
<http://www.rider.edu/users/suler/psycyber/publish.html/>

http://nytimes.com/library/books/041000oed-online.html OED online