Jon Udell writes about RSS aggregators. If the phenomenon of blogging continues, soon many people will come to realize that they can use some automation of their daily routine of reading other people's blogs. Also, more and more people will "get" the idea of syndicating news posts.
We're clearly at the very beginning of this development. The tools like Aggie are pretty primitive, so there's lots of opportunities outthere. Email, IM, blog writing, news reading will come together in a few years in a very powerful way and the discuvery of RSS is a good step in that direction.