It's not true that this blog is so wonderful you don't need to read any others, especially since I'm not the best at posting frequent updates. But between the brilliant posts here, there are some other things to read.
For conservation, the Safina Center blog is one of the more authoritative spots ton which to alight. Dr. Carl Safina, author of Beyond Words, a book I absolutely loved, is one of the most important scientists on the planet when it comes to telling us all about the health of said planet. (Read my review here.)
For something completely different... the Dinosaur Toy Blog is a unique resource for all of us who love dinosaurs and their representations in models, toys, etc. It will bring out the kid in you even as it informs. The authors keep up on the science and critique the newest offerings of dinosaurs, prehistoric mammals, birds, fish, invertebrates, etc. with an expert eye.