https://posterous.com/
To start your child’s first blog today that takes just minutes to set up, I recommend using Posterous. Five of my children currently use Posterous because they can update it from phones, web browsers, and even by email. You can load just pictures too, which is very convenient for younger children when they want to show more than explain or discuss what they are doing. The blog will also allow you to have it titled with the right descriptive you want without having to yet buy a domain name. I recommend your child creates multiple blogs, one for each big skill he is developing as part of his talent.