Bookshelf, page 7 This page is a bit different. These are not really positive psychology books. But they are popular.
The Happiness Project by Gretchen Rubin. Not really a "science of happiness" book but a good read. Rubin spent a year trying different things people suggest bring happiness. Some were scientific, some not. She blogged about it (still does) and wrote this bestseller.
The Geography of Bliss by Eric Weiner. This is not positive psychology. It is more like good travel writing that uses happiness as an organizing principle. He goes to some of the happiest and unhappiest places on earth, looking for the secrets. A fun read.
I do understand the concept of "...for dummies" and "the idiot's guide to...". Simple introductions to complex topics are useful, especially for the non-specialist. And, yes, some positive psychology research is tough to read. But there are so many well-written, accessible books (many of which I've mentioned on the previous few pages) that I really don't think you need to go to these books.