As far as I know Bedouins are used by Southern Command in the Negeve desert as trackers, using camels. They mostly patrol the border zone with Egypt, searching for drug smugglers, human trafficking, and, of course, terrorists and other threats. In the north they have been used extensively in somewhat similar roles, although they usually not employ camels. They probably took part in the Lebanon war this summer, but I have no sources on that.
The information I have comes from a newspaper article I read quite a while ago, so it might be that some of this does not hold true any longer.