I’m reading Phil Murray’s first http://www.kmconnection.com/ (free download), and it’s excellent. I’m not saying that because it mentions me, or because I host the The Faceted Classification Discussion (FCD) mailing list together with Phil. (Disclosure always.)
Anyways, it’s the magazine every IA should read (especially for enterprise work) and I hope it takes off and Phil makes enough money with it (yearly subscriptions are US$ 170) to be able to keep it going for years to come. IA needs magazines like this.