Microsoft’s SQL Release Services blog, information on the release of service packs and cumulative updates for SQL Server.
SQLServerCentral.com, the gathering place of 1.8 million SQL Server DBAs, developers, BI analysts, etc. Excellent source of information, I’ve been using them as a resource for who knows how many years. The site is site sponsored by Redgate Software.
Simple Talk, another collection of SQL Server information. They have some excellent columnists here, I especially enjoy Phil Factor. Also a site sponsored by Redgate Software.
Redgate Software, a fine purveyor of SQL Server utilities.
Utter Access, a forum/wiki system to help people with Access, VB, SQL Server, etc.
Stack Overflow, a part of the Stack Exchange network, devoted to database. This site is not exclusive to SQL Server, here you’ll also see the likes of Mongo and Oracle. Stack Exchange has an amazing selection of discussion areas that is well worth checking out.