Specialist sites provide news on one subject. Although data held on the web are often not quite what you want, it may be a good pointer for directing a request.
Some data are extremely timely.
Almost all major organisations now have a web site. Some merely present a prospectus of the organisation, while others may be more detailed. The best method of finding jobs is through mailing lists Daniel Kammen has prepared a useful guide to careers in energy and environment MET-JOBS archive Mailing lists Public discussion forums distributed via email. There are a few sites that try to be all things. They combine rich content with timely news and well-maintained lists of links.