I hope your router supports WPA or WPA2 encryption. I have experimented
with WEP cracking software and it's surprisingly easy. I now use WPA2 with
a random 63 character password. I have had trouble with some characters in
linux though, it seems ", ', /,\,# are interpreted by the underlying shell
code. Someone correct me if I'm wrong, but I have had to use passwords not
containing those characters. If you want to see some software that can do
wireless packet capture and WEP cracking, check out BackTrack4. It's a
security/foresics/penetration testing distribution based on Ubuntu which has
a great collection of packages maintained by their own repositories. As you
would expect from something based on Ubuntu, it's free (as in beer) and open
source. It's a great way to test the security of your network though. Best
of luck...