Hi, Kimberly--

I wonder if he'd be interested in any math history? That might be a way to add breadth/depth without speeding up any more for now. Julie Brennan's Living Math site has lots of great suggestions ( www.livingmath.net ).

People will doubtless be getting tired of me (!) recommending these, but the computational linguistics puzzles at the NACLO site are really fun, and use mathematical thinking in a very different way. ( www.naclo.cs.cmu.edu/index.php )

What about cryptography? There again, lots of math, but a little bit different, and pretty fun, if he's that kind of a kid (one of mine is--he just finished a two month-long unit study on the Enigma machine).

If you're really feeling venturesome, you could jump into some symbolic logic! I had some of my old university logic texts out today for the kids to play with a little bit--symbolic logic is good stuff!

Or another goodie, topology--one place to start might be here:
http://britton.disted.camosun.bc.ca/jbrubbergeom.htm

Anyway, maybe one of these ideas might interest him? Nothing wrong with a little detour...

peace
minnie