I have nothing to offer right now; I just wanted to bump this up to the top of the reading order b/c it deserves an answer.
That said, I think there was an issue of BYO that addressed the use of coffee in brews. I'l try and dig it up. I've only used lactose recently, in an Imperial Russian Stout. That was in the last twenty minutes of the boil. It is still in the secondary and will be there for awhile.
(added 6/25): Maybe this will help: http://www.byo.com/feature/1020.html