The format of this file might be similar to a bibliography, but make sure that with each paper, you include the file name. An index written in HTML is preferable because this allows users to view and save the files without actually worrying about where they are located. Of course, you still need to add in the title and probably co-authors, but the file name is no longer of much consequence. A good name for this file might be index.html . There is more than one reason to use this name actually.
Most servers look for certain files before displaying a directory index.
The first is that any Web client will be able to read the file if it is in this format, not just people with postscript previewers. The second reason is that HTML allows you to put in your various anchors. If your paper is long, you can use these anchors with a table of contents, allowing users to jump straight to certain sections without scrolling through the rest of the paper. If any of your references have been placed online, you can even provide anchors that allow users to jump to these references. To assist you in converting files to HTML format, there are some tools that will try to convert files for you.