Coolsig
Signature files, mostly quotations, sorted by categories. Also has an email list to join from the site.
Esther's Signature File Collection
Collection of ASCII and text signatures. Collecting since around 1990.
Sig-List
Show and tell e-mail signature moderated list. Primarily for all those who design fancy e-mail signatures and others who use a signature with their e-mail. Suggested topics are: ASCII-art, quotes, netiquette, sig-file, software, how to make signature files and the type of information you should include in them.
Signature Files of jgs
Collection of Joan Stark's signatures.
Signature Museum
Variety of ASCII art collected by Menno Pieters.
Sven's Signature Collection
Collection of more than 150 ASCII signatures.