The .14 and .15 drivers suck. They removed signal reporting, and Dragorn has no intentions of making a patch until they release a more stable version of the drivers. He has been trying to get them to release a version of the drivers that include per packet signal reporting and monitor mode, but they will not do so. There was patches for the .15 drivers, but they no longer apply th the most recent CVS version of the drivers.
The link to the .13 drivers are already patched and ready to go
And they are the most reliable.
Glad that my little mini-howto helped. FC5 is coming soon, so I will have to figure what they broke all over again.