2. crisderaud29 March 2010, 9:27 GMT +02:00

BBC Wildlife is opening its Photo Masterclass archive. The series covers everything about shooting pictures outdoors. This includes time-of-day considerations, wildlife portrait settings, and shooting underwater.

Each of the 21 issues focuses on a different topic. They include step-by-step shooting guides and advice from expert photographers. You even get suggestions for ideal locations and equipment purchases.

http://www.bbcwildlifemagazine.com/masterclasses.asp

The classes are recommended by Komando.com in addition to the reference Dave gives above from Lifehacker.
That means they are gaining great popularity.