Design Theory Resource Server - A research project founded by the UK Engineering and Physical Sciences Research Council.
D.H. Rees Home Page - Information on Nested and Orthogonal BIBDs and related topics.
Distributed.net: Project OGR - Describes the computerized effort to prove that the known shortest Golomb rulers (up to 25 marks) are really the shortest, or else find the actual shortest ones.
Golomb Rulers - Table of lengths of shortest known Golomb rulers, counts of optimal and near-optimal rulers, and some Fortran programs for dealing with Golomb rulers.