Kelby Training

• Kelby Training is an online photography school founded by veteran commercial photographer Scott Kelby. Kelby Training includes seminars on lighting as well as courses on specific camera models like the Canon 60D and Nikon D7000. Kelby Training requires tuition of either $199 per year or $24.95 per month, as of 2011
  
  

Digital Photography School

• Digital Photography School is a blog with loads of content on how to master your Digital SLR. Articles written for the DPS are accessible for free and include information on how to master group pictures, focus and event photography. DPS offers a free weekly newsletter full of photo tips for any takers.
  
  

Digital SLR Photography Guide

• The Digital SLR Photography Guide is a free online photo school aimed at beginners. The site includes beginner tips as well as guides about SLR settings and post-processing. The online guide also provides reviews for various photo equipment.
  
  

Steel Training

• Steel Training is an online photography course aimed at mid-level shooters. Phil Steele is not a big name photographer, but he offers guidance from lessons learned from his own transition from an amateur to a professional. Steele's tutorials are free after you sign up on his site.