It is very easy to find out all you need to crack WEP
For an old unix hand like you, certainly
I stand by what I wrote about most people being unable to do it. What has happened is what I predicted a while ago: some relatively easy to use software tools have appeared just for the job.
The basic point is that unless you are trying to hide something seriously confidential, the objective is to prevent people freeloading off your ADSL connection, and WEP will do that just fine.
To steal something, even if somebody cracked the wifi security, they would then have to gain access to the PCs. Which should not be completely trivial, if you have set up a login+password on each one. In fact it "should" be impossible - remaining windoze back doors aside.
One more thing I forgot to mention in my last post: configure the DHCP client count in the router to the actual number of your PCs. By default it is set to something like 100.