John P Sheehy wrote:

Like a RAW RGB histogram?

AFAIK, the only low-end D-SLR with an RGB histogram is the Sigma SD10,
and it's there for a very good reason. It's not like any major player
is putting this feature into their amateur or prosumer models. But who
knows. We haven't seen the spec on the D80 or D200 yet, but they should
be out soon.