K5 Learning has an online reading and math program for kindergarten to grade 5 students. I've been given a 6 week free trial to test and write a review of their program. If you are a blogger, you may want to check out their open invitation to write an online learning review of their program.
Since I have kids ranging from 4 to 10 (not including the baby of course), I am always open to trying new programs that might enhance our homeschool experience. I'll let you know in 6 weeks what I think of their program!