Miata magazine ceased publication a few years ago as the result of the trademark crackdown on the use of the word "Miata". Advertisers were to be affected resulting in loss of projected revenue according to the publisher among other problems. The magazine has come back as "MazdaSport" and is Mazda product centered. Last issue was Volume 2, Issue 3-2005. It's about 40% Miata related (that's an estimate, not scientific). Club pages (there are a few) are still Miata Club oriented as the other models do not have many clubs. Barbara Beach still does the magazine but signed off on her column in the last issue.
There was a link on Miata.Net for subscriptions or go to www.mazdaevents.com. I read last night that the "Knobmiester" has been instructed to cease use of the various trademarks.
Carl