"CTAN lion drawing by Duane Bibby; thanks to www.ctan.org". The Comprehensive TeX Archive Network. The TeX Users Group. A TeX leaflet (pdf). The TeX showcase. The texhax mailing list. TUGboat is the journal of the TeX Users Group, its table of contents is here.
The CNMS User Form in LaTeX is here.
The 1922 edition of Updike's book on fonts is available from google.com. Note that there are two downloadable pdfs, one for each volume.
Have you ever wondered about pdfTeX, pdfLaTex, XeTeX, luaTeX, luaLaTeX, and the future of TeX? See luatex-doc.pdf. From the document: "...[LuaTeX] is the designated successor of pdfTEX and includes all of its core features: direct generation of PDF files with support for advanced PDF features and micro-typographic enhancements to TEX typographic algorithms...'' and it goes on to list the features. See also the table in the same document to understand the different engines and their capabilities. There is a roadmap for luaTeX. There are more great TeX projects, including ConTeXt and LaTeX3 (with a news page). We live in interesting times for TeX and typography.