I am a keen user of TeX, via the LaTeX variant created by Leslie Lamport. I have been a member of the UK branch of the Tex Users Group for several years. I tend to produce most of my documentation using LaTeX. This allows me to produce PDF and postscript files (via DVI conversion programs) and RTF files (via latex2rtf). The RTF format is an open format but due to its close integration with Microsoft Word for Windows it is useful for people that require documents to be in a Microsoft format. I used to use latex2html to create web pages from my LaTex documents, but have now found that HeVeA does a better job and is much faster.