I’ve added another sidebar to my Tools for XML-Deviants. This one just provides quick access to the archives and search function of all of the public W3C mailing lists.
It’s just a quick hack using an XSLT stylesheet to process the W3C archive homepage which happily is XHTML.
Personally I find this preferable to keeping lots of bookmarks, although admittedly the list of archives is rather long. Hope you find it useful too.