I recently bought a set of carbon fiber tent stakes from Titaneum Goat at this link:http://www.titaniumgoat.com/stakes.html
They've done a great job of improving this product, compared to their original stakes. They now have a flat top and a metal point.
The stakes have great holding power for their weight.
I'm a little bias because I had suggested these changes. They did a much better job of implementing these suggestions than I would have if I had made the stakes, however.