It would seem that most businesses these days are still not getting involved in business blogging. Here are some statistics from an article published on eMarketer.com:

Only 5% of UK corporations use blogs on a regular basis
5.8% of Fortune 500 Companies have a public blog
1.5% of Forbes 200 Best Small Companies have a public blog

I [...]

Business blogging was initially viewed with a great deal of skepticism. An associate recalls that after carefully pronouncing the word ‘blog’, that a quizzical expression would immediately register on his listener’s face.
Of course, with the addition of podcast marketing, RSS, video casts and all of the other assets built into an effective blog site platform, [...]