Germany's law that bans unlocked wireless networks is being judged by the European Court of Justice.

Running wireless networks without a password is an important contribution to your community. What's more, it is the only way you can refuse to be conscripted as an enforcer in the War on Sharing. Even if it is illegal, it is your duty. Don't be afraid of the punishment; it won't kill you, and it is unlikely enough that your expected cost is tiny.