WEP and WPA encrypt the data - without them you're sending plain text across the air. MAC address filtering will prevent computers that aren't on the list using your router. MAC address filtering is not enough on it's own. Experts in the field tell me it's possible to jump in between a wireless card and an access point and read packets as they go past - regardless of mac address filtering. If the packets are unencrypted that means your credit card details etc. go past in plain, human readable text, which is not something you want happening. make sense? Joe, at very least enable 128 bit WEP.