Billiards Digest (
www.billiardsdigest.com) and Pool & Billiard Magazine (
www.poolmag.com) are it for national mags. Inside Pool used to be good, but they fell off sometime back years ago. There are several regional publications published by Don "Cheese" Akerlow, out of Montana, that are distributed all over the country. You can subscribe, or pick them up free at your local poolroom or bar. Then there's Professor QBall's magazine, which is all about carom billiards.
Scott Lee
http://poolknowledge.com