I just got the new wifi card I ordered from dealextreme, and what suprised me was that it was bundled with a Benini Linux Live Disc. And from that linux distro you can actually run a wifi password cracker. Also comes with a simple guide to cracking WEP/PSK etc. I tried on my own router with WEP, and it found the key within minutes!
It only costs 23.8 USD, and IMO its worth it!
– IEEE 802.11b, IEEE 802.11g, IEEE 802.11nup to 150 Mbps raw transmission rates
– High 1000mW transmission power for ultra long range operation
– Supports 64, 128, 256-bit WEP, WPA, WPA2 security mode
– Supports WMMTM (Wi-Fi Multimedia), BT3, Software AP (Access Point)
– USB 2.0 connectivity
– 2.4GHz-2.484GHz frequency
– Detachable antenna
– Operation range up to 500m (indoor) / 1000~2000m (outdoor) – manufacture rated
– Supports Windows 98SE, ME, 2000, XP, X64, Vista, Mac, Linux
– USB cable and 2* drivers CD included