a couple of LINQ tools
Visual LINQ Query Builder is an add-in to Visual Studio 2008 Designer that’s developed to help you build LINQ to SQL queries through a friendly interface. The tool can be seen in action here - http://blogs.msdn.com/mitsu/archive/2008/04/02/visual-linq-query-builder-for-linq-to-sql-vlinq.aspx and available for download from the MSDN Code Gallery - http://code.msdn.microsoft.com/vlinq
LINQPad is proving to be quite successful and seen as a tool that’s not only useful to learn LINQ but also for dev purposes. This tool:
- supports C# 3.0 and Framework 3.5 (LINQ to SQL, LINQ to Objects, LINQ to XML)
- comes with 200 preloaded examples
- offers code snippet IDE
- free and only 2mb in size
more here - http://www.linqpad.net/

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