I notice that Khalidi's name is all over the blogosphere. I do not know the man directly. He was, however, the Ph.D. supervisor of my own Ph.D. supervisor. Or as I like to call him, my Doktorgrossvater. I saw him speak once at SOAS. I thought his talk was very good. It was certainly not "radical" compared to many other speakers on Palestine at SOAS. Indeed, other than in the context of US politics, where any criticism of the State of Israel is taken as "radical" could Khalidi be considered anything, but a moderate. But, of course in the US even opposition to such extreme Israeli policies as torture and killing children is often denounced as "anti-semitism."
I have not read most of what Khalidi has written. But, what little I have read is quite impressive. For my Politics of the Middle East class this semester I assigned the piece below.
Khalidi, Rashid, “Observations on the Right of Return,” Journal of Palestine Studies, Vol. 21, No. 2 (Winter 1992), pp. 29-40.