On May 20-24, the 12th international World Wide Web Conference is held in Budapest, Hungary. The deadline for posters is tomorrow, Feb 7, and for "developers day" on Feb 14. Among the developers day topics (http://www.www2003.org/dd/) there is one titled "[D7] Authoring Techniques and Tools for Accessibility and Device Independence". This sounds very interesting, like it could turn into a wiki workshop. I don't know if I can go there, but perhaps someone else can.
Read all about it at the conference website, http://www.www2003.org/ or at W3C's http://www.w3.org/Conferences/Overview-WWW.html
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