Polymer Cafe is the leading (and only!) magazine for polymer clay artists. Its a US publication but read worldwide (if by a somewhat niche audience).
And I appear to have met my not-quite-a-resolution from the beginning of 2008 by getting something published in it (I think the resolution was more to do with my regular jewellery in jewellery mags but this comes close :o) plus its the only thing I've submitted all year so thats cool), namely a picture in the reader gallery (I should point out the reader gallery tends to be damn good artists - I'm obviously a novice by comparison, especially given that my mask has been placed next to possibly the most accomplished polymer clay sculptress in the world. Les Polinko is amazing).