As interest in corporate and business blogging increases, the number of listings of these types of blogs also increases. The Fortune 500 Business Blogging Wiki at http://www.eu.socialtext.net/bizblogs/index.cgi is a good starting point and lists active public blogs by company employees about the company and/or its products. According to the web site authors, Chris Anderson (Wired Magazine) and Ross Mayfield (Socialtext), only 27 (5.4%) of the Fortune 500 are actively blogging. Not surprisingly the majority are in the IT sector but notable exceptions are General Electric, General Motors, and MacDonald’s who run a Corporate Responsibility Blog. An alternative listing together with comments on updates and new blogs is at Fortune 500 Blogs (http://www.fortune500blogs.com/)
The Fortune 500 covers US companies only but there is a link from the Socialtext bizblogs page to a handful of Global 1000 blogs at http://www.eu.socialtext.net/bizblogs/index.cgi?global_1_000_business_blogging and one to a list of European corporate blogs at http://www.corporateblogging.info/europe/. Unfortunately, the latter will no longer be updated after April 2006 but for the time being it is still a useful list.
Another excellent starting point for corporate blogging is the NewPR Wiki at
http://www.thenewpr.com/wiki/pmwiki.php, which has lists of CEO blogs by country, corporate blogs, product blogs and and business podcasts. There are also sections on blogging policies, legal challenges and articles on business blogging.