CertExams.com (http://www.certexams.com) has released Cisco Switch Simulator http://routersimulator.certexams.com/switch-simulator.html
The software enables candidates to learn configuring a Switch using Cisco IOS commands. Several hands-on labs have been given for thorough preparation. The lab index is given here:
http://routersimulator.certexams.com/switch-simulator-labs.html
The simulator supports several switch commands as given here:
http://routersimulator.certexams.com/commands.html#List%20of%20Switch%20Commands%20Supported