This seems a sensible page, but needs clarification (preferably in the lead) of why key distribution in WSN is important, and particularly how it differs from the general case of key distribution (eg 802.1/802.11). The current content seems ... a little light on just why this is an interesting or important issue. Things that might be pertinent could be low power nature of WSN nodes, intermittent operation, low amounts of energy/memory and limited processing cycles precluding compute intensive handshaking as used in 802.11 - however, I don't have any references at hand and won't do for quite a while. Or I'd take a crack at it myself. 