I went out and searched for a router that supports the guest feature and found that the Cisco Valet supports it for the price of $90 bucks. Not too bad.
I am really interested in how my school does it though. I not sure how it works, but can an ACL be setup to deny "network discovery" access to every user who authenticates? Being a school, it has to do this for 30,000+ students.
One last thing, what does the setup of a campus area network look like? Is it just daisy chaining many routers together to provide wifi to each building?
I am not setting it up but would like to know for educational purposes.