Nice!
http://www.linqpad.net/
LINQPad lets you use the new LINQ language and execute queries in a lightweight environment outside of Visual Studio and SQL Management Studio.
Pros:
- Make simple queries to a database for debugging, etc.
- Get results with a LINQ query before using it in managed code.
- Use LINQ to debug data regardless of the platform of the app that uses the data. For instance, a .Net 1.1 app could be debugged with LINQ using LINQPad.
Cons:
- Queries run slower than straight SQL.
- Only works against a Mircosoft SQL Server database.