LINQ to SQL tech and tools

LINQ to SQL is a great addition to the .NET 3.5 Framework. It is supports: MS SQL 2000,2005, and 2008 only. There are some really cool tools (SQLMetal and SQLTac) too....

http://msdn.microsoft.com/en-us/library/bb425822.aspx provides a good introduction and overview.

Additional links:
SQL Metal Open Source User Interface (http://sqlmetalosui.codeplex.com/)
SQLTAC (http://www.sqltac.com/)
SQLMetal.exe (http://msdn.microsoft.com/en-us/library/bb386987.aspx)