I am interested in something more than everyday Math for enrichment. Any suggestions or experience would be appreciated.
I'm looking to condense the Math for DS next year in 4th grade to minimal and supplement with something he could do at school and home. It would be great to have something that generates reports or progress.

We have been using the Mindware Math books which have been great. I thought it maybe a good idea to look into some other options.

Has anyone tried
http://www.noetic-learning.com/gifted/index.jsp
(from Davidson Data base)

or Art of Problem solving

There is a good list of math workbooks in Developing Math Talent. If we were supplementing math right now, I'd start there.

Also Prufrock Press.

thank you

We've used the Challenge Math books in the past. They are very cute with cartoon characters who introduce the concepts. I do think that they are good books that put things in real world context and are written to be comprehensible by kids. We started with his Ten Things All Future Mathematicians and Scientists Must Know book to get my dds interested in knowing how this info would be applied in real life and then did Primary Grade Challenge Math. For a 4th grader, you will probably want the Challenge Math, not Primary Grade Challenge Math, though.

Depending on the grade/level...

ALEKS is great for assessments, practice and reporting.

Mathletics also provides reporting and practice, but a little more "fun" and game-based.

IXL Math is good, but doesn't provide instruction.

I also like Gizmos, Aha! Math and Adaptive Curriculum for instruction and practice.

Maybe a combination of ALEKS (for reporting/assessment) and Mathletics/Adaptive Curriculum/Aha! Math for fun, interactive lessons.