I prefer Zymurgy over BYO. Both are very good though.
If you are not a member of the AHS, you should join today. $38 a year is a fantastic deal for the magazine, pub discounts and supporting a great organization that aims to keep politicians from meddling with our hobby. The pub discounts alone usually make up for the cost of membership.
Welcome to the Brewers Association
As far as general-interest beer magazines go, I haven't found any that seemed worth the purchase price.
The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Primary: Saison, Berliner Weisse, sLambic I, sLambic II, IPA, 70/-
Secondary: Orange Blossom Mead, Flanders Red I
Kegged: Fat Man Porter w/ 1469, Fat Man Porter w/ 005, Centennial Falcon w/ Conan, Centennial Falcon w/ Denny's, Barrel-aged Fat Man Porter, Belgian Dark Strong, Dark Mild