Although the workindex article Learning Goes Mobile is aimed at a professional context, there's nothing to say that in the future, students can't use mobile technology to receive learning support. The way mobile technology is going, soon all mobile telephones will have facilities (document readers, audio players) that could be exploited by educators. Perhaps it is too far fetched now, but I'm sure it won't be in a couple of years.
Obviously, the problem is the same as always - that not all students will have access to these devices. But, it could be interesting in the future to try out a blog aimed at students who have access to these devices.