W3C is the home of the governing body of Web experts, the folks who make all the rules and think big thoughts about the future of the Web:
http://www.w3.org
The Web Standards Project (WaSP) is "a grassroots coalition fighting for standards which ensure simple, affordable access to web technologies for all." Read up about the organization's work with browser manufacturers and standards, and find out why it matters:
http://www.webstandards.org