Participate in forums or chats, read articles, and sign up for newsletters at About.com's Databases site.

This group focuses on techniques, code samples, how-tos and other Data Mining issues.

BeyondRelational.com focuses on the relational and beyond relational features of SQL Server. Along with the blogs, groups, interviews, and forums, it runs a number of activities such as 'TSQL Challenges', 'DBA Challenges', and so on that focus on helping people enhance their SQL Server skills.

Get the latest info direct from MS sources at the Microsoft developer community site.

Join discussion boards or sign up for discussion lists on SQL Server.

Learn more about SQL Server, aspecially as a backend for Web technologies.

PASS is the definitive global community for SQL Server professionals.

A site devoted to Microsoft SQL Server content, CLR Integration, high availability, performance tuning and optimization, troubleshooting and tips.

Microsoft SQL Server Community Worldwide is a one stop SQL Server resource site that was formed by Microsoft employees leading the internal SQL Server Community within Microsoft and many external passionate SQL Server gurus from across the globe.

Check out this podcast series featuring SQL team members, SQL MVPs, and other luminaries of the SQL community talking about the latest stuff: features, issues, and more.   

SQL Server Magazine is an independent source of technical, how-to information for SQL Server developers and administrators.

SQLServerPedia is a community-driven Wiki moderated by a group of SQL Server database professionals with a decade or more of experience in their field.

A collection of white papers useful for SQL Server professionals.

SSWUG provides grassroots database resources for users, administrators, and developers.

SQLAnswers.com offers useful freeware and shareware for common tasks, such as sending SQL mail over SMTP, formatting query results in PDF and HTML, and searching DTS packages. You'll also find forums and links to other SQL sites.

SqlJunkies is an online community where developers can come to learn about building solutions by using SQL Server while being part of a collaborative community of peers.

SQLServerCentral.com offers you thousands of SQL Server articles, FAQs, scripts, and forums to help your professional development as a DBA, developer, or user of SQL Server.

Check out this site for SQL Server performance & tuning information.

Find articles, current news, and forums to answer your SQL Server questions at SQLTeam.com

SQL Server Worldwide Users Group is dedicated to bring you the most current information available on a daily basis, designed to assist both developers and administrators.

Become a member of the forum and take advantage of keyword searches, notification, and personal profiles to help you get the answers you need.

Find articles on SQLXML development, or join the dioscussion group to share code & information.

Get in-depth information on OLAP technologies from Nigel Pendse, one of the most respected analysts in the business.

Get data warehousing information from one of the pioneers in the field. The site includes articles, design tips, and more.