Wepness
Wireless security is really difficult to manage. I upgraded the firmware on one of my el cheapo wireless cards and had to reconfigure it to connect to my wireless network at home.
Being somewhat security concious, I use WEP on my home network. Of course, I mistyped one of the characters in my WEP key when reconfiguring the card and couldn't get a valid ip address. I got some crazy internal ip address (169.*.*.*) but had a solid radio connection. So, since I had no idea what the firmware upgrade had done, I spent a good hour or two poking around at various settings. Finally, I decided to retry the WEP key and it worked. The driver's way of telling me that I had an invalid WEP key was to give me an invalid ip address. Seems fair, doesn't it? Of course, nowhere in the documentation is it mentioned.
No wonder there are so many unsecured networks out there (I just found one in my neighboorhood this evening). There has got to be a better way.