I have now figured out how to add an image to a blog.
I can also add text to the image after it has been added to a posting. It requires two applications on the machine I am using, Picassa to organize the images on my machine and Hello, to send an image to the blog. Both applications are free downloads from Google. They are easy enough to use, in fact Picassa is a nice organization, making all the images easily available. I think the image selection would be done by a teacher. Students could prepare text on their AlphaSmarts and with a teacher checking, send to a new posting on the teacher's blog. Students could take the photos using books or real objects.
Ideally, this would be useful if engaging in a dialog between two or more classrooms that were sharing information with each other on a daily basis while doing research on a topic.