For thinkers, I would recommend Malcolm Gladwell's four books: Blink, tipping point; Outliers; What the Dog Saw. Those are thought-provoking books.
For the essay learners, I would recommend Anna Joy's We are America. The essays selected by this book are excepts from masterpieces and more are oriented to immigrants who are new to America. The book is an expensive text book for essay wriitng.
There is a book called "don't sweat over small stuffs", which is pretty good read for people facing work stresses.
Depend on your interest, you might find "rich dad poor dad", "who moved my cheese" enjoyable.
For lovebugs, "Men are from Mars, Women are from Venus" is quite popular.
My recommendation is pretty comtemporary.