Petrowatch (India) http://www.petrowatch.com/
Indian Energy newsletter, subscription based but with free headlines, very amusingly written and informative
Simmons & Co http://www.simmonsco-intl.com/
Influential US energy advisor's newsletter and research articles, it is free but requires registration. Also includes a directory of oil service companies from a financial point of view.
PESGB http://www.pesgb.org.uk/
Petroleum Exploration Society of Great Britain, The main UK based society for petroleum geoscience professionals, new improved site with member directory available in members only section