Links

http://www.sqlpass.org/ - Professional Association for SQL Server site that brings together SQL professionals

http://blog.sqlauthority.com - The SQL Authority site is an great reasource for all things SQL

http://www.brentozar.com - Brent Ozars Site provides deep knowledge from a leading SQL expert

Some other SQL Professional's sites worth checking out:
Tom Marshall - https://jungamonga.wordpress.com/
Sebastian Meine - http://sqlity.net/en/
Denny Cherry - http://www.dcac.co/
Joseph D'Antoni - http://joeydantoni.com/