Wong's book Casino Tournament Strategy is still the best resource in print. More books are on the way though, including mine.
For monthly articles on tournament strategy, Tamburin's BJ Insider is worth the subscription fee. I write a monthly column there, and there are often other tournament contributions.
While I'm at it, I'll mention that this month's issue of Casino Player magazine has part one of an interview with me and Joe Pane, and part two will be in the August issue.
Another print magazine is going to be increasing tournament coverage, and I'll have more details on that when it is officially announced.