I’ve always found the IMI Galil rifles one of the more interesting variations of the Kalashnikov AK design.  I thought you might find the following links of  interest if you want to learn more:

IMI Galil Page on Wikipedia
http://en.wikipedia.org/wiki/IMI_Galil

IMI Galil Assault Rifle (Israel) – On World Guns
http://world.guns.ru/assault/isr/galil-e.html

IMI Galil ARM / SAR Assault Rifle / Carbine / Submachine Gun / Designated Marksman Rifle
http://www.militaryfactory.com/smallarms/detail.asp?smallarms_id=23

The following video is very informative.  It shows the rifle being made at IMI, interviews designers and talks about some of the unique features: