Originally posted by: MercenaryForHire
Cliffs: WEP of any strength is worthless, and can be cracked in about five minutes. Use WPA, and make a good random key.
Yep, the only defense WEP, even WEP-128 has these days is unprotected networks, i.e. even easier targets than yours, and this is changing. In my area, in casual scans, most connections are secured. In some places, police do wardriving, and if they can identify the source of an unprotected wireless network, warn them about it.
I've had in a break-in when using WEP-128 and SSID hiding together in a home environment; I won't use or recommend it any more -- WPA-PSK (with a strong key) is a minimum for me, and this is generally so easy to get that it doesn't make sense to use anything less. In cases where there's old equipment with no software updates in the last several years, I'd replace it -- wireless can be pretty cheap if you look around.
Of course, if you can't afford WPA, and don't mind the risk, then WEP-128 is a bit better than nothing.