it's highly unlikely anyone will take the few minutes needed to crack your WEP.
I don't see how anyone could easily crack a well made WEP password. Mine is like 20+ digits of totally randomized letters and numbers...
Actually, the FBI recently demonstrated how easy it is to crack that. They used commonly downloadable tools, and it took them a grand total of three whole minutes to crack a 128WEP.
As for the unprotected wireless WANS out there, it isn't so much the fact that they're unprotected that bothers me, it's that every time some fucking schlep in my near neighborhood gets a wireless router, he DOESN'T TAKE THE FIVE MINUTES WORTH OF FUCKING TIME TO SEE WHAT ELSE IS OUT THERE, AND THUS SETS IT UP EXACTLY THE SAME WAY AS MINE.
Meaning : same channel. My wireless had stopped working since Sunday, couldn't figure out, tried to fix it again tonight, still no go. Fuck.
I finally do a survey of the area, and find some new prick set up his wireless lan on the same channel as mine. Fuck, is it THAT hard to survey and pick a channel nobody else is using??
I swear, 95% of the people in this world should not be allowed anywhere NEAR a computer.
As for the unprotected ones, you could connect to it and then try to attract their attention through a /net send message, but that will only work if they haven't turned their messenger service off. Then again, someone smart enough to know that will protect his wireless network.
Log into their router, see if they still have the defaults, then turn it off. That should get their attention.
Actually, I had one here earlier who was unprotected, I just put a little notice near the mailroom warning "whoever has network xxxxx, beware that it's unprotected".
Turned out to be my downstairs neighbor, who thanked me profusely.
As far as your data, I wouldn't be that worried about it. If you didn't share any drives, and don't have file and print sharing turned on, it's not THAT easy to get at those files, especially if you have some decent file security up and running. They'd have to literally crack one of your accounts to be able to copy files.
Unless, ofcourse, you DO have file and print sharing turned on, and have Everyone with Full Control on all your files...