I just finished this book and think its one of my favorites of all time. Super easy read considering its about evolution.

Anyone recomend anything that deals with popular science or psychology that is also easy to read?

For cosmology, try:
Coming of Age in the Milky Way by Timothy Ferris or
The First Three Minutes by Steven Weinberg.

For evolutionary theory, I recommend:
Almost Like A Whale by Steve Jones

For popular psychology/brain science, you may like:
How The Mind Works by Steven Pinker

and the absolute best book on clinical depression I have ever read (and I've read a few), Malignant Sadness by Lewis Wolpert