Hi
I noticed there are some binary ebuilds with suffix "-bin" such as
openoffice-bin. I'd propose adding a new variable BINARY_KEYWORDS into
openoffice ebuild and remove openoffice-bin ebuild.
The syntax of BINARY_KEYWORDS is as same as KEYWORDS. When people
prefer binary ebuilds, they can do 
BINARY_KEYWORDS="x86" emerge something
and emerge will do install a tbz2.
When a maintainer decide to add binary support for some arch, they add
new archs to BINARY_KEYWORDS. We may need BINARY_SRC_URI also for tbz2
files. 
We may also form binary arch herds just like arch herds  :)
Is this possible?
-- 
Bi Cờ Lao