Below you find my most valuable SQL Server and database related links. To make it a bit easier to find what you are looking for, I have categorized the links. Click on a category to display the links.

Give feedback, report bugs etc ( is gone as of 2018):
SQL Server feedback forum

Miscellaneous SQL Server web sites
Glenn Berry's SQL Server Performance, including DMV diagnostics queries
Erland Sommarskog's in-depth articles about dynamic SQL, arrays in SQL, error handling etc.
Brent Ozar, sp_BLITZ
Ola Hallengren's solution for SQL Server backup, integrity check and index optimization
SDU Tools, lots of useful functions from Greg Low
Contribute changes to Books Online
Free deadlock collector and parser, by Andreas Wolter
Essential SQL, good basic into of SQL (the language), normalization, etc.
Lots of connection string examples
PASS - The Professional Association for SQL Server
Query store custom SSMS performance dashboard
Trace flag list

Versions of SQL Server

Most recent update of SQL Server
Version history,
SQL Release Services Blog, find recent releases

Monitoring tools, comparsions etc
Periodically collect performance data and visualize it using Brent Ozar's solution
Database Health Monitor from Steve Stedman
SQL Server Tiger Team's performance monitoring solution
Tiger Team's toolbox
SQL Server performance monitoring tools comparsion
"The Ultimate list of Top SQL Monitoring Tools"
Erin Stellato's performance logging solution


Home page (check out the blogs from the members)
Wait Types Library
Latch Classes Library

SSIS related
Component listing on Codeplex - By Darren Green and Allan Mitchell

Tools: Retrieve data from the transaction log
ApexSQL: ApexSQL Log

SQL Server e-book gallery
SQL Server virtual labs
SQL Server Licensing
Microsoft SQL Server Home
Connect: Microsoft SQL Server Feedback
Database Engine Permission Basics

General databases
Library of Free Data Models
Database Debunkings
The Data Administration Newsletter ( Foyer
Intelligent Versus Surrogate Keys

General stuff
NIST Dictionary of Algorithms, Data Structures, and Problems
Sysinternals utilities
Dependency walker