The BBC has launched a new news blog called The Editors. After being initially disappointed that it wasn't an editorial viewpoint on the news (though that is dealt with elsewhere), I was pleasantly surprised. The Editors comes across as an in-depth Points of View, giving a personable face to a large corporation and covering the reasons behind some of the decisions the BBC makes which impact on their customers.
Informing customers is a great reason for a company publishing a blog, especially one as large and as public as the BBC. They've also ensured that they have gathered staff from the web, TV and radio, giving a wide base of topics, each with their own RSS feed.