LinSSID
Graphical wireless scanning for Linux
...LinSSID may be installed either by downloading source or binary from this site, or if you're using Debian/Ubuntu or one of its brethren, adding a ppa to your software sources and then installing it with your favorite application manager.
You can add the repository with:
sudo add-apt-repository ppa:wseverin/ppa
Builds are available for amd64 and i386. Please report problems on the 'discussion' tab.