In a previous post I made a passing reference to the Fortune 500 Blog Project, described on the wiki as follows:
The Fortune 500 Blog Project is an independent, volunteer-driven project to identify and evaluate public-facing corporate blogs owned and/or operated by Fortune 500 companies. Secondary purposes of this project include finding out to what degree Fortune 500 companies are using internal corporate blogs, and highlighting blogs that discuss Fortune 500 companies.
This ambitious project is maintained by two people who, judging by their blog posts, probably qualify as among the busiest people I know or know of, Easton Ellsworth of Business Blog …read more

There seems to be no shortage of stories about big business and blogging and for anyone interested in what, say, the Fortune 500 companies are doing there is the excellent Fortune 500 Blog Project wiki.