All web users will find something of interest in the CERN Welcome page and anyone confused by the jargon should take a look at MIT's `The World Wide Web for Dummies'. Learners of HTML may find help in the notes I started taking when I began learning HTML. HTML is now being improved to include style sheets and decent display of mathematics, with which I'm now experimenting.
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Ladislav Kocbach has a rather nice system for hyptertext mathematics which he's used in conjunction with TeX-generated formulae (which you can haul into html by using xv to cut pieces out of the xdvi window displaying your dvi file). There's also a tool called Hypermail available for folk who want to compile Web (HTML) pages from e-mail (thanks Suzi ;^). Now all I need is a babyl version or an emacs interface ...