Oh, I'm using WPA2 at the router (and SSID is turned off) but I'd need to reflash my router with a different operating system (ddWRT) in order to be even more steathy and invisible. You could probably see a lot more XABD if you were to look around with something like MACStumbler and I know that there must be hacker tools that could break into at least some of the wireless connected computers or even some of the routers. It's not knowing how good the Firewall is on the MAC and the laptop that concerns me.
I'm using my wireless PC laptop right now and my connection tool (Intel chip set stuff) that comes up with my router comes up with Freenet (a wireless company here in town) and two other routers that aren't secure (the Freenet needs a password which I don't have to actually do anything); there is also a Linksys router called "Linksys Not Secured" which really is secured (someone made a joke)!