Blogs seem like a good idea but I think you've got to have a clear idea of what your purpose is. The process of choosing a blog title, username, password etc is rather harrowing. In a library environment this may be easier because it would be something related to your library.

I'm looking forward to learning about the different technologies, I consider myself fairly web savvy but there is a lot I don't know or have any experience of, RSS for instance or mash-ups.