I see following question quite common on Twitter or in my email box.
“What is Denali?”
Denali is code name of SQL Server 2011.
Here is the list of the code name of other versions of SQL Server.
In 1988, Microsoft released its first version of SQL Server. It was developed jointly by Microsoft and Sybase for the OS/2 platform.
Any guesses what should be the next version after 2011 should be codenamed?
Reference: Pinal Dave (http://blog.SQLAuthority.com)