This is a pretty cool looking tool from the Stack Exchange people called MiniProfiler.

You just add some profiling info to your code like this:

using (profiler.Step("Doing complex stuff"))
{
    using (profiler.Step("Step A"))
    { // something more interesting here
        Thread.Sleep(100);
    }
    using (profiler.Step("Step B"))
    { // and here
        Thread.Sleep(250);
    }
}

and see the result live in the browser like this: