Jakub Narebski [off-list ref] wrote:

Junio C Hamano wrote:

quoted

 - git-blame learned a new option, --incremental, that tells it
   to output the blames as they are assigned.  A sample script
   to use it is also included as contrib/blameview.

And there are example GUI blameview (Perk GTK2), and example Emacs module
for incremental git-blame, both in contib/ area. 

Not to mention the incremental blame viewer built into git-gui:

	git gui blame HEAD foo.c

-- 
Shawn.