Expensive unique homes in beach areas (LJ, SB) which are difficult to price sell at values the market determines rather than comps which are hard to come by.
Distressed east county markets (Ramona, VC, Alpine) have no buyers and get slaughtered.
Looking at the least discounted markets (follow linky) and you will see the foreclosures havens where asking prices are heavily discounted already provide little room to negotiate. nothing surprising there.