Originally Posted by Mr Beardsley
1. SSID being off. Won't help you at all...so why bother?
2. WEP. The problem with WEP is that it uses one key for the entire time two devices are connected.
I think the point of these two is to keep out casual wireless-stealers: the ill-educated folks in the next apartment who aren't going to actively try to sniff packets and crack encryption.
Also, some devices (I'm looking squarely at you, Nintendo DS) still do not support WPA. If all devices on your network do, though, you should indeed absolutely choose WPA with a strong password over WEP.