If you do any development using Microsoft SQL Server, a really useful tool available is SQL Profiler. This tool allows you to see queries submitted to the database which is useful for measuring performance, fine tuning as well as tracking down and debugging errors. Unfortunately, this tool is not provided with the SQL Express series, on the full and developer versions. This is no problem when you have Profiler for Microsoft SQL Server 2005/2008 Express Edition.

This free utility is open source and does exactly what the enterprise tool does, but does not have all the bell and whistles. For the price though, you can’t beat it.