Reddit mentions of Prehistoric Life: The Definitive Visual History of Life on Earth

I know of a few books that might suit your needs pretty well. The DK Prehistoric Life Book is a pretty massive tome with info on loads of different dinosaurs and prehistoric plants and animals. There's also the Princeton Field Guide to Dinosaurs which is just about dinosaurs and is more sciency looking, but its more quantity over quality when it comes to dinosaur descriptions and the writer has some odd theories about Dinos that he injects here and there.

*ninja edit

I loved Prehistoric Life. It's an encyclopedia but I read it in its entirety. It has extensive dinosaur coverage but also covers other prehistoric life which is also very interesting in its own right. It is very up to date.

Prehistoric Life (link is to Amazon listing for the book). A lot of interesting things about prehistoric life, evolution and the way the atmosphere (and entire planet) has changed over the millennia.