http://public.eu-egee.org/
Enabling Grids for E-sciencE (EGEE) is funded by the European Commission and aims to build on recent advances in grid technology and develop a service grid infrastructure which is available to scientists 24 hours-a-day.

http://www.westgrid.ca/usersAccess/AG-Station-Guide.pdf
Building an Access Grid

http://gridcafe.web.cern.ch/gridcafe/
The GridCafé explains to non-experts what the Grid is and what it could soon be.

http://www.gridpma.org/
Grid Policy Management Authority
Grid PMA objective is to establish world-wide trust for Grids

http://www.apgridpma.org/
APGrid PMA
Asia Pacific Grid Policy Management Authority APGrid PMA supports Grid communities in Asia Pacific to implement a common trust domain across organizations.

http://www.grids-center.org/
The Grid Research Integration Development and Support (GRIDS) Center has been created through NMI to define, develop, deploy, and support an integrated national middleware infrastructure in support of 21st Century science and engineering applications.

http://enterthegrid.com/

EnterTheGrid is the largest catalogue of Grid related information in
the world. It contains information on all the companies, projects and
products in the Grid market.

http://www.globalgridforum.org/

http://www.pragma-grid.net/

http://www.apgrid.org/

What is Grid Computing?