If you're a regular surfer of the ID/evolution blogs and forums, you've no doubt run across several discussion about "epigenetics" lately.
Epigenetics, epigenetics, epigenetics...
Well, believe it or not, PZ actually wrote a whole post on the topic without succumbing to his tendancy to digress into an atheistic rant about religion. It's quite interesting, but what I enjoyed even more was a link that Greg Patterson referenced. At that PBS site, you'll find several articles, Q&A's and short video clips that provide an easy to understand explanation of epigenetics.
Go check it out!!!