It's at release candidate 3 at the moment, and so far it looks flawless 
on AMD64. I think they're going to release in a week or so, unless a lot 
of bugs show up. Can a release candidate tarball get put in Portage? 
It's on Sourceforge at

http://internap.dl.sourceforge.net/sourceforge/oprofile/oprofile-0.9.4-rc3.tar.gz
-- 
M. Edward (Ed) Borasky
http://ruby-perspectives.blogspot.com/

"A mathematician is a machine for turning coffee into theorems." -- 
Alfréd Rényi via Paul Erdős