Valve software are heralded as the major crusaders of PC gaming and responsible bringing our beloved platform back from the ashes into mainstream culture.  The Steam platform alone has elevated PC gaming beyond that of a passing interest to be a major player in this generation of gaming.  Which brings me to:

The ValveCommunity.com Directory

A fantastic showcase of communities built upon Valve's own Game and Steam related releases.

Each website page contains a basic screenshot, a brief and factual description, a direct text link, a community rating, a list of games it covers, descriptive tags and a full length screenshot