I just got to know this one and I wonder whether it would be worth to use it for lyx:
http://mirrors.ctan.org/info/visualFAQ/visualFAQ.pdf Wolfgang The Abstract says: This document provides an experimental new “search” interface to UK TEX FAQ (http://www.tex.ac.uk/faq). Rather than require the user to formulate a query, it merely presents examples of customized LATEX formatting—and formatting problems— encased in live hyperlinks (green or red, as appropriate) to appropriate pages in the FAQ. The goal is to facilitate finding answers to LATEX-related queries which are difficult to formulate textually but easy to recognize visually. In short: If you want to learn how something in this document was formatted or why it came out missformatted, just click on it.
