I have been playing with wep a while ago, but never finished my "research" so i never really published my results.
However a friend of mine brought to my attention that IV attacks are "resurrecting" [at least on this forum].
WEP attack developers may find my work useful, so ill just post it.
http://sorbo.darkircop.org
I encourage to try out the version 0.2 of the cracker [especially -w and -g options].
Have a read through the paper about the 13% stuff. It was new at the time... i do not know if it is new stuff now.
By new I mean... a correct implementation...
http://sorbo.darkircop.org/wlan/sorwep.txt