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We are running phat architecture (WLSE, ACS, 1230 AP's) and PEAProtocol. I want to create additional SSID's on every AP (WPA-PSK) for vendors.
My questions is this: "Are there any good documents that discuss the creation of dual SSID's, VLAN/AP configuration, and/or best practice approaches?"
jep there are some documents.
Using VLANs with Cisco Aironet Wireless Equipment
For usage of a WLSE, PEAP and ACS have a look here
Protected EAP (PEAP) Application Note
Additional Information about WDS can be found here
Wireless Domain Services Configuration
These documents will give you the right hints for your task.