I am looking for a book that is not too rigorous but provides a good introduction to psychology as a preparation for a university-level course. Any suggestions? It is an introductory course.
Making Up The Mind by Chris Frith is fantastic for a casual introduction to general Psychology concepts. ( http://www.amazon.com/Making-Mind-Brain-Creates-Mental/dp/1405160225/ref=sr_1_1?ie=UTF8&qid=1386952875&sr=8-1&keywords=Making+Up+The+Mind )
I would also recommend Bonk! by Mary Roach if you're looking for an easy read to ease you into the topic of Human Sexuality within Psychology. ( http://www.amazon.com/Bonk-The-Curious-Coupling-Science/dp/0393334791/ref=sr_1_1?ie=UTF8&qid=1386952898&sr=8-1&keywords=bonk! )
Both of these books are informative and educational, and present what would otherwise be extremely dry research as entertaining prose.
Also, I would highly recommend going to http://www.ted.com and watching any of the talks by Vs. Ramachandran - Ramachandran is extremely talented in explaining Psychological concepts in a down-to-earth manner.