Have a look at "Free profiler for .NET" from http://www.compuware.com/solutions/microsoft.htm

>>I saw a demo of it early this year. I don't remember the runtime analysis that it gives, but one of the neat features that I remember is that it analyzes your source code and points out possible gotchas (e.g. using string concatenation instead of the stringbuilder.)
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>I see. I'm reading everything that's on their website and researching a bit more to see what else we have out there.