S = author's site
E = author's e-mail
C = contributor's site/e-mail
The "S" or "author's site" link would be removed if the site doesn't exist anymore. The "E" or "author's e-mail" will be there as how I know/received it unless there have been changes. The "C" or "contributor's site/email" will be posted with permission of the contributor with his preference whether it go public, whether it features his site or his e-mail. Feel free to contribute! They're VERY welcome =)