SDM is a fine tool for users who have limited knowledge of the Cisco IOS. Personally I don't use the SDM, but understand and respect the fact that not everyone knows/understands the good old CLI mode.
Baculus, post up your router configuration so we can check it up and give you an answer to your problem.
The Etherswitch module you've installed is like an actual Cisco switch and supports multiple vlans (including vlan databases), VTP and other protocols.
Keep in mind that you must enable IP routing on your router in order to allows packets flow from one network to another. This can be done by entering the command 'ip routing' on your router's global configuration prompt [ Router(config)# ip routing ]
