Not sure if this is allowed to be discussed here, but there isn't really any way to crack WPA passwords that I know of. You'll have to look into rainbow tables which will help you to bruteforce the password. You can start by looking into the backtrack linux distro.
google the linux distribution "Backtrack" .. It's a Linux Live CD that contains everything you're looking for.. and it's free. Good luck!
I've found that just asking people for the wifi password usually works. Politeness gets you everywhere. You could spend all night and possibly a few days figuring out how to crack your neighbors wifi, or you could just ask politely and it will be done in 5 minutes.
I have lot of experience in this,but still i wanna learn,i hope someone atleast have advanced code for tkiptun-ng if y know what i am talking about,or mybe something more
