Yep I used engine analyzer pro.
Sorry SBCfan04 I thought you were talking about desktop dyno specifically.
You can download a demo here for both the normal and pro version of engine analyzer.
http://www.performancetrends.com/download.htm#eapro
The demo's work for 10 days.
I have also used camquest and desktop dyno, but I think engine analyzer pro is alot better.
No experience with dynosim.
Just my 2Cents.