Just drop this into a directory on your web server to get nicer directory listings, thumbnails of any images, etc. Similar to the way that Windows XP changes how directory contents are displayed depending on the contents. (Via www.gordonmclean.co.uk)
Scott Adams (he of Dilbert fame) has released one of his books for free as a downloadable PDF. I haven't read any of it yet, but it's going on the pile.