I think that "Micro-Blogging" is set to the be the next big thing. As people are increasingly prepared to share their lives with the rest of the world and the ease as which people can access the internet through mobile devices increases so does the scope for "Micro-Blogging." 

Micro-Blogging is where people fire off terse missives about what they are doing at any given moment.   I have read some micro-blogs and they appear to be rather random and more an up-to-date on-line diary together with random thoughts.

In Australia through the Telstra 3G phone network you can update your blog over the handset.    

More on micro-blogging here.
 

An example of a Micro-Blog