Just FYI, big companies and interesting people who use wordpress.com (or its VIP service) for blogging:

• CNN blogs - CNN anchors, correspondents and producers all over the globe.
• flikr blog - official blog of flikr.com, almost certainly the best online photo management and sharing application.
• BBC Worldwide use WP VIP for some of its projects: Sunday Afternoon Club blog at topgear.com, Human Planet blog at bbcearth.com, etc.
• TIME blogs - time.com correspondents and producers.
• TechCrunch - technology events.
• Symbian blog - the official mouthpiece of Symbian Foundation, maintainer of Symbian OS.