Besides Tattoo Artist magazine, I still like Tattoo Society. Skin Art, ITA, and some of the European 'zines.
The best magazine out there though, in my opinion, is the free to download Tattooist Art magazine. Right now it is only available in digital form, but this coming issue (#5) will be a printed hard copy as well. For now, I recommend downloading all 4 current issues. Some of the most stunning work out there right now is coming out of Russia and Eastern Europe, and they are heavily covered by this publication. They also did a feature on ol' Nick B, and one of my other favorite artists, Victor Portugal.