Pongsathorn does a nice job of concisely drawing equlivalences between stages of human development, between Wilber and Kegan.  Please take a look, if you get a chance.

A couple of additional comments:

1.  If you go and join Ken WilberYahoo Groups, there is a lot of this type of "high-level" intellectual commentary about higher stages.  As I've said before, this isn't my main focus, as I am focused on integral practice rather than integral theory. (Yes, one comes out of the other, but I want to simply plug in my apple Ipod, and reap the benefits.  Go ahead - call me lazy!).  It would be very, very good, if this high level integral discussion, is continued on a group blog such as Crooked Timber - a blog of aethestic philosopher types, and what interests them.  But that same format would be good for Integral Theory types.  (Be careful not to start believing the map is the territory though.)

I won't post on that blog - but I'll link to it frequently!

2.  There is quite a western history of the view of 8 stages of consciousness, that goes back pretty far.  Here's a link to Robert Anton Wilson on the eight systems of consciousness. 
Tim Leary was drawing these connections in 1962.  (He was also attempting to connection them to science, and psychedelics and other goofy stuff, but it is worth reading).

Is there a timeline of how the eight level consciousness has shown up in western thought? 

I think it would have started with Sri Aurobindo, and then stayed there, getting picked up then in the sixties, and then filtering to the various psychological techniques in the 60's/70's,  finally ending with Ken Wilber and the transpersonal pyschologists. 

Is that accurate?