have you read this thread http://www.elitetrader.com/vb/showthread.php?s=&threadid=2724&pagenumber=2 and search the archive.. few simulators out there but some are useful.
Here is a link to demos of the Infinity Simulator Platform for eminis: http://www.infinitybrokerage.com/promo/atpj.aspx View the videos, and if you like what you see, E-mail/call Patrick and he will get a free real time LIVE trading simulator demo to you that does NOT expire.