It all depends on how willing you are to share your bandwidth and, possibly, the information on your computer with wireless eavesdroppers. WEP encryption is very weak and easily broken. WPA is considerably better and WPA2 is still better. If you live at a long distance from other homes then it is not likely that there will be casual hackers trying to tap into your connection. If you live in close proximity to other homes or apartments then it is very probable that a few folks will be sniffing around for loose security.