Read Instructions Carefully
This is the VoodooWireless compiled for 32-bit and 64-bit. It is explicitly using Mac OSX 10.7 Lion as it's base SDK and may not work on lower versions.
There are 2 versions of VoodooWirelessCipher_WEP, the 'VoodooWirelessCipher_WEP.kext' compiles from inside the 'VoodooWirelessCipher', while the 'VoodooWirelessCipher_WEP 2.kext' is the standalone WEP source tree.
You can use your existing VoodooWireless drivers, however I could not compile the Intel 3945ABG for Lion, it seems that some parts of VoodooWirelessIntel3945 driver are still not open source.