I was never really interested in this topic, but it was the subject of much discussion at chucks_angels (well, it was a fair number of posts by a relatively few number of posters -- as is par for the course for these discussion groups).
The topic is how environmentally safe is fracking?
Apparently much of the recent discussion was ignited by a New York Times article.
[Hey, how safe is anything?]
*** [7/4/11]
Somewhat related: gurufocus commentary on New York Times vs. Aubrey McClendon