Rhod's Collection of Dance Notations
I have an electronic version of the notation for several hundred dances, mainly contras. This is stored in a special format that I cooked up, based on TeX macros. The advantage of this is that it is easily machine readable (and possibly eventually machine interpretable) and allows users to customise the final output to suit their own notation standards, of which there are many. Ultimately, I plan to convert this into SGML or XML.
At the moment I can easily get it to produce nicely formatted PostScript output, and it should not be hard to get html generated from the same source files - I have just not got around to it yet, so I'm afraid you are just going to have to sit back and wait for me to get around to doing the work to make this page the way it should be.
Other Sources of Electronic Notation