After being charmed by his airport book, I checked out Alain De Botton's The Consolations of Philosophy. Oh, such fun. I had no idea I was such a Stoic, but De Botton's section on Seneca showed me I am. (This would be my mature outlook. I was more of a Hedonist earlier in life, naturally.) Anyway, the concept of this book is that whatever you're facing - heartbreak, ennui, aging, job stress - there's a philosophy to help you through it. Each philosopher's history and teaching is related to a current situation, making it a very amusing and different kind of self-help book. Eminently approachable, too - I don't now have a deep knowledge of any of the great philosophers, but I do have a pretty good precis of a field I never paid much attention to before this book.