The Blogger blogging service http://www.blogger.com/ can be used with your York credentials right now. You can use blogs to create simple diary or news-like web sites. Blogs can be used as public marketing, for departmental news or for personal reflection. Whether a blog is traditionally "professional " or more and informal is your choice.
Note: Although integrated with your York Google account, it is not fully integrated with York Google Apps. This means that you can't limit access of your blog to "Just People at the University of York" or your department.
See Also: 31 Reasons You Should Blog About Your Research.
Some examples, in no particular order, of blogs currently in use at York include:
The Guardian's Higher Education Network has an article on academic blogging and a useful list of "research blogs" in its directory. You can also find Higher Education tweets about blogging using the #HEblognetwork hashtag.
You can search for blogs that might be of interest to you using Google's Blog Search Engine.
My own work blog is the Collaborative Tools Project, in which I share Google Apps ideas. Having started this blog in Easter 2012 some posts now receive hundreds of views from around the world when posted ( and additionally promoted on Twitter and Google+ ).
This site is Work In Progress and forms part of the IT Services Google Apps at York help pages.