Originally Posted by
Melville
What kind of philosophy are you interested in?
Plato is very readable, high-quality, covers a lot of topics, and introduces many of the issues that reappear throughout the history of philosophy. But I can't recommend a particular text.
A book I recently read, Bergson's Time and Free Will, has some good stuff to say about human experience of time (though it has a lot of silly stuff to say too), and it's an easy read.
Nietzsche is very readable and a great writer, though I don't agree with much of what he says. I'd recommend Beyond Good and Evil to start.
A lot of the 20th century analytic philosophers use purposely simple language, since they are reacting against the obscurantism of people like Hegel. For analytic philosophy, you could try Ayer's Language, Truth, and Logic, or Wittgenstein's On Certainty, which are both good. But analytic philosophers focus a lot on the details of systems of language and logic, so they can be somewhat dry.
A lot of Eastern philosophy is also very readable. The book of Chuang Tzu (a Taoist book) is both funny and interesting.