Below is a link to all the major shale gas fields in the United States and Canada. The Haynesville Shale has most of the shale buzz, but Horn River Shale could be just as large one day!
http://www.haynesvilleshales.com/shalefields.html
Also check out:
www.bakkenshale.net
www.marcellusshales.com
www.oilshalegas.com