I think documentation for web plugins are very up to date. Here they are:
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Documentation:WebPlugin (the reference)
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ActiveX/HTML (maybe a bit outdated, don't know)
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ActiveX (maybe a bit outdated, don't know)
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HowTo_Integrate_VLC_plugin_in_your_webpage
The test.html page can help newbies to use VLC:
http://git.videolan.org/?p=vlc.git;a=bl ... d0;hb=HEAD
And quite many samples are spread in this forum.
Of course you can contribute, at least on the discussion page of the documentation to give uncovered things you think relevant to add.