Cricket2 - The Explore sounds like an interesting option and it would be unlikely for him to be at the top of their testing level. Without additional acceleration, DS7 will be studying 5th grade math with enrichment (4th grade GT curriculum) as a 3rd grader next year. If he accelerated any further, he will have to take Algebra as a 5th grader, which would be difficult to schedule.
HowlerKarma - ROFL. Aren't these kids incredible? Often times it takes more time and effort to figure out how much less to do that it would have taken to just produce an honest effort. I hear what you say about independent study. While DS7 loves to read and learn other things independently (without interference), I just don't see him being happy in a corner working math by himself on the computer.
Tallulah - I read a couple of chapters of the Developing Math talent book online. I am debating about buying it. She raises some interesting points, but I am not sure that I completely agree.
