Here's Rick Riordon's blog:
I thought that would keep you updated. And I found these books at Barnes and Noble all about famous heroes and demigods. It has Perseus, Theseus, Hercules, and even Jason. (There are a TON!) I always wanted to learn more about Jason, the famous half-blood that they mention in the books. There are many authors:
I think there's more, but that's all.
-Zoey Daughter of Zues