Here's a paper that is increasingly cited as providing evidence for epigenetics playing an important role in evolution. I've booked the Aquarium from 13.15, Thursday in a week.
Feinberg, A. P., and R. A. Irizarry. 2010. Stochastic epigenetic variation as a driving force of development, evolutionary adaptation, and disease. PNAS. 107:1757-1764.