[rvid]

You're also screwed if you have WiFi Protected Setup enabled (Its enabled by default in most routers). Once can easily crack a WPA2 passphrase easily in a few hours using a tool like reaver.

[ohashi]

Care to elaborate?

[rvid]

Look here: http://sviehb.files.wordpress.com/2011/12/viehboeck_wps.pdf

And here's a link to the tool: http://code.google.com/p/reaver-wps/