A look through lens

I thought useful and interesting for visitor of A Look Through Lens to find a collection of links, mainly related to photography, but also covering other matters like solidarity, human health, planet conservation, ecc.
Any comments and suggestion will be much appreciated.

• Photographic Blogs
• Photographers Sites
• Photography Communities: Showcase, Shared Photography and other
• Photography Magazines
• Photography Resources: Gears, Softwares and other
• Photography Tips and Tutorials
• Photography Contests - Photography Challenges and Memes
• Blog Communities (in progress)
• Web Resources (in progress)
• A Look Through Lens around te web
• Exchanged Links
• Friends
• Save the Planet
• Solidarity and Human Health