AMP: Artists' Meeting Place and Resource Collective

The Joy of Shards
http://www.thejoyofshards.co.uk/
From their site, their "aim is to share an enthusiasm for mosaic art and provide a high quality, extensive online resource where visitors can learn about mosaic making and study examples in a wide range of styles and materials. There is also information on related aspects of tiles, ceramics and tessellations." Check out their excellent collection of mosaic galleries from locations all over the world.