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 About Mandalas 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.
The C.G. Jung Page is a great place to start for information on Jung. Many good links here.
Online shopping at C.G. Jung.
Maureen Roberts offers Jung Circle which includes the archive of the fireside discussion list, an early Jung email forum I participated in. Deborah Mattingly Conner webmasters Jung Circle and has her own site there.