Here is collection of links to some cool site I think you should check out.

General

The Reading Project- Reviews of books from a variety of genres.

Pandorapedia- The authoritative field guide to Pandora and the World of Avatar.

Blogs

Worldbuilding Pasta- Helpful blog with the purpose general purpose guides for creating geologically accurate worlds.

iguanodont - Creator of Birgworld Worldbuilding project.

b1asho -Creator of the Wreck Hounds Worldbuilding project.