What evolutionary algorithms are there that model epigenetics? What evolutionary algorithms are there that model or incorporate some notion of epigenetics? What are the pros/cons of those approaches? Are there vast insufficiencies or wide-open questions about their usefulness?
Over the last few years, evolutionary computation research has shown increasing interest in including some aspect of epigenetics. For example:


A 2008 paper by Tanev and Yuta
Work from Lee Spector's genetic programming group
A recent paper by Ricalde and Banzhaf