I have been wanting to create a blog for my kids, so they could post as they are learning to read, are into various toys, and as such could write and post about their interests.
As I was contemplating creating it, and it is done now at Longest Brothers. Not only will this be an interesting diary, it will also be an interesting research tool as to what boys their age are influenced by and their interests.
Ironically I ran into this, as eMarketer and others realize this is a hot demographic. Here is a text vs. call comparison chart. Very useful.