Check out the growing list of links here.
The following text should be included on any sla fansite, to keep Nightfall happy about their IP (intellectual property).
"SLA Industries and all characters, settings, images and other intellectual properties pertaining thereto are © 1993-2006 Nightfall Games Limited, and are used without permission. No challenge to those copyrights is intended or implied."
Further details about the Nightfall IP can be found here.
The original Cognate WebRing run by Neil de Carteret is at: http://www.webring.org/cgi-bin/webring?ring=cognate;home.
There is also a more up-to-date web ring can be found at: http://slaindustries.net/static2.php?load=webring/goring2.php