www.observersbooks.com - Run by Martyn Cordey the site is intended as a resource for collectors of  Observer's Books and related material.  The main feature on the site  is a fully  illustrated directory of all jacket variations, to which  collectors can refer to see books they may be looking for.

OPSCS
The official Observer's website, keeping collectors up-to-date with news and events and giving details on how to join.

Observer Mart -
A site run Gary Jex: OPSCS Membership No. 471 a collector who sells and swaps books.