How to be a Stoic by Massimo Pigliucci (author of the article)

A Guide to the Good Life by William Irvine

I also read The Obstacle is the Way by Ryan Holiday, which read too much like a self-help/business book to me. It might be to some people's tastes, but I found it lacked the substance of the two above. Ryan Holiday does have Daily Stoic email newsletter which is often interesting, though.

Edit: Also, the 2003 Hays translation of Meditations is a much more accessible version of the text. I wish it was still in print.