John Resig - Deep Tracing of Internet Explorer
http://ejohn.org/blog/deep-tracing-of-internet-explorer/

dynaTrace Ajax works by sticking low-level instrumentation into Internet Explorer when it launches, capturing any activity that occurs

After reading a recent post by Steve Souders concerning a free tool called dynaTrace Ajax, I was intrigued. It claimed to provide full tracing analysis of Internet Explorer 6-8 (including JavaScript, rendering, and network traffic). Giving it a try I was very impressed. I tested against a few web sites but got the most interesting results running against the JavaScript-heavy Gmail in Internet Explorer 8.

notes on dynatrace - traces/graphs everything that IE Does.

dynaTrace Ajax works by sticking low-level instrumentation when it launches, capturing any activity that occurs.