Penwest Pharmaceuticals Co. Q1 2008 Earnings Call Transcript <a href="http://seekingalpha.com/article/79530-penwest-pharmaceuticals-co-q1-2008-earnings-call-transcript?source=yahoo" target="_blank">http://seekingalpha.com/article/79530-penwest-pharmaceuticals-co-q1-2008-earnings-call-transcript?source=yahoo</a>