Though the following magazines are not focused entirely upon polymer clay, they do feature polymer clay-related articles (some more often than others) and may be of interest to the polymer clay artist or hobbyist.
Art Doll Quarterly http://www.artdollquarterly.com/
Art Jewelry Magazine http://www.artjewelrymag.com/art/default.aspx
Bead&Button http://www.beadandbutton.com/bnb/default.aspx
Bead Style Magazine http://www.beadstylemag.com/bds/default.aspx
Belle Armoire http://www.bellearmoire.com/
Dollhouse Miniatures http://www.dhminiatures.com/
Step by Step Beads http://www.stepbystepbeads.com/sbsbeads/