I started writing one of those back in 2005 when my MMath finished. After writing over 1000 pages of loosely-packed LaTeX I discovered ProofWiki which had only just started up. Been writing for it ever since. But I still have that original LaTeX and can at a pinch generate the PDF again (although it’s seriously iffy in places).
In the meantime if you want to join ProofWiki (google it) then if you can handle the iron-rigid rules for contribution, you’d be more than welcome.
Newcomer, mathematician by species; freethinker, secularist and rationalist by nature. Abrasive and irreverent, if I haven’t annoyed off at least five pompous people in any given day, it’s a day utterly wasted.