Yes, the L-Space Web has been signed by Terry, or at least its original host computer was.
This picture shows Terry at the Leamington signing in Autumn 1996. He is holding tanstafl.lspace.org, the machine on which The L-Space Web was originally developed. As you can see, he has just signed it with:
The L-Space Web
Ty Pratchett
[Picture of a scythe]
Or at least that's what I think he wrote on it *grin*.
Robert Collier
The L-Space Web is a creation
of The L-Space Librarians
This mirror
site is maintained by A.H.Davis