It seems like he disappears once you get the quest from Strobur to find his brother. Ladyterry - Where did you find him the first time? Was he in the brewery?
On another note, you can get the easter egg if you use the large, fat sand colored bottles of dwarven ale - you DON't need Rimmer - go to any tavern and get some, but it has to be the large fat bottles - not the skinny ones, or the red ones. <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />