Culturally Designed Math- uses cultural designs to explain math principals. The students get to have a 'hands-one ' expereience and make designs of their own ustilizing the principles.
Illuminations - from the NCTM . Lots of visuals , lesson plans and standards.

Grade 8
Algebra Games - In addition to the Algebra Games, there are links at the top for other types of math games
Interactive Algebra - from Hippocampus, created by the Monterey Institute for Technology and Education

Grade 7

Grade 6
Mrs. Lowry's Blog - sign in to make comments on her question of the week
A Page for New ( and not so new) Math teachers- I found this site from a newlsetter. It works for teachers for grades 6 through 8 and even has a link to an algebra and Material science class. unbelievable amount of information.