It started with Cecily at Formica, but I found it first at Lynne's diary. This is all of the posts in the Black Bloggers -> Blag Blogs -> Identity Blogging conversation, in roughly the order that I became aware of them.
Lynne d Johnson
Cecily
P6
Colorado Luis
P6
Cobb
Glenn
P6
dcthornton
Yvelle
Oliver Willis (not really, but...)
P6
Glenn
P6
Jason
P6
Candicissima
Yvelle
P6
Lauren
P6
Terry
Erica
P6
John Constantine
Greg
P6
Lauren
P6
Aldahlia
P6
Greg
alegna
astridiana
Mac Diva
Cecily
Luz Paz
Erica
Kim
Robin
S-Train
Phelps
P6
These posts alone are not the whole discussion. The comments are often excellent, and you can find links to related topics in them. And I can't guarantee having caught all of the discussion—in particular, any branches that exist in the Conservative side or the purely non-political-commentary side of BlogNet will probably have gone beneath my radar.
The Promethian Position Paper or As Simple as Possible, But No Simpler
Trumping the race card