Got a copy of Flush, didn't rate it, didn't buy it again. Maybe it's improved.
Poker Player magazine has plenty of articles covering strategies, tournaments, interviews, etc. Good range of bits and pieces, and with a good balance between solid advice and irreverent touches to lighten it up.
There's also the WPT magazine now, which was also OK, but a bit too focussed on hyping and discussing their tournaments rather than being a well-rounded coverage of the poker scene.
Inside Edge I haven't read - maybe I'll have to pick up a copy.
Online Gambler I think sometimes recycles old articles from Poker Player, but it's still worth a look since it's free with other mags.