Clare Goodwin's Mandala Page
was one of the first web sites I came across that discussed mandalas. A great
place to start if you're looking for online information about mandalas and
artists who are creating them. Clare features a mandala of the week, and on
offers mandala portraits and a lot of information concerning mandalas. Clare publishs a newsletter about mandalas called New Moon Newletter. You can sign up for it on her newsletter registration page.
I offer MandalaBooks at books.fourcircles.
Harry Bosma has a mandala page on his Healing Dreams web site. This is another of the very early sites that mention mandalas.
The folks at the Mandala Project are doing great things. I especially like their What is a Mandala? page.