If you just wanna have some free access to routers, i would suggest,
www.r1r2.com. If you telnet to www.r1r2.com, you ll gain access to 2 cisco 2500 routes, serially connected....Most router simulators, doesnt work well enuf......atleast...they dont have all commands and features of a real router, implemented............
You can download a trial version of sim, called netsim, from www.boson.com
Mentor labs are another set of labs which are one of the best simulators....
last but least...search the web...for router simulators....
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus