References for TeX and Friends is an ongoing project which provides a help file for LaTeX (and its friends like ConTeXt, Metapost, Metafont, etc.) using a state-of-the-art source format, DocBook/XML. Various output formats can be generated from the source file. Anyone can write a converter for any desired output format. Because the source file is XML, the easiest way to do this might be to use XSLT.
The Linux ATA RAID HOWTO explains how to set up RAID 1 (disk mirroring) and then install Red Hat Linux on the mirror device. Promise Technology was one of the first companies to come up with quasi-hardware RAID for inexpensive IDE hard disks. This document covers using the Promise proprietary RAID driver as well as the Linux native ATA RAID.
The Postfix-Cyrus-Web-cyradm-HOWTO document guides you through the installation of the Postfix mail transportation agent (MTA) and the Cyrus IMAP server. The goal is a fully functional high-performance mail system with user administration via Web-cyradm, a Web interface. Data like virtual users, aliases, etc., are stored in a MySQL database.
The Linux MIDI HOWTO describes the hardware, software, and procedures needed to play and sequence using MIDI under Linux. It covers configuring your MIDI interface, playing MIDI files, sequencing, controlling external MIDI equipment, MIDI-controlled software-based sound synthesis, and example MIDI code.