I had no idea, but there is a magazine dedicated just to mosaic art. Now, it’s only yearly, but still a publication that I didn’t know previously existed. I have a copy and the quality of the issue is more book-like than magazine-like: nice, heavy paper, fold crease, well laid out, and lots of pictures [this is important for an art publication and not all art publications actually show the art].
Oh, and they have a blog too.
[above image is "Nightshirt" by Julie Richey]