Two router setups are common with wifi. You'd want your "inner network" to be secured (using encryption), and the "outer" network insecure. Guests to your home, or network devices with no or poor security features can use the insecure network. All of your own stuff is safely protected in your inner network.

Also see DMZ, or "demilitarized zone" on wikipedia.

__________________
:: Devlog - New developer blog with useful PHP information
:: WeTalk.tv - TV Forums