From the blog post:
It is not so much about the tool and what it can do, but more about the purpose for using the tool. Obviously, if students want to share pictures of a project they are working on, a digital camera and a blog make a lot more sense than a flipbook. Still, don't count out older technologies just because you are trying to be a "21st Century Educator." Sometimes a dry erase marker and a wipe-off slate will do the job just fine.