Yes, Wong's book is still an excellent choice despite having been published several years back. You can get it here as well if you can't find it locally.
http://www.blackjackinfo.com/catalog
For many years, I recommended Wong's book as the best introduction to counting, but there's no doubt it's pretty dry reading. In the past few months, my recommendation has changed. Kevin Blackwood's new 'Play Blackjack Like the Pros' is the best new addition to the literature in a long time. It's an easier introduction, peppered with anecdotes from his play.