FF Drifting has always been a debate. For FF, sliding around is more referenced as "a** Dragging" since the car would be sideways, but the rear ends do nothing in keeping the car sideways.
To allow an FF car to go sideways, proper weight shifting on a FR car can still be done with an FF, the only problem is holding a drift, since there isn't power coming from the rear wheels. Continuously pulling the e-brake and locking up the rear tires will allow you to keep the rear end sliding, and proper braking, throttle and steering control will allow you to hold the power required to continue sliding. Look at the following video as an example:
http://www.youtube.com/watch?v=EFUegaEibwE
Now keep in mind , the drifting seen in the video and the drift techniques mentioned by mcheddadi are for show drifitng.
I believe that FF's can drift in the form of race drift, where letting the car slide slightly allows for a more open throttle when going around certain corners, and in the sense of FF cars, it compensates for the understeer that FF cars normally experience.
As for videos of drifiting the Altima, I would love to go out and try to slide around my Altima, but I would not want to risk ruining a car that practically brand new to me. I'll save my drifting needs for my MR2.