I found this article to be quite interesting. Too many times business blogs are all about "me" (the company, it's product(s), "getting the message out") perhaps that doesn't work. Too stuffy, no fun.
Perhaps creating a comic or cute comment that fits the day just might add some levity to your blog and show that you are a "real" person.
Check it out at AdAge...
Marketing: A Brand's Best Bet in Social Media Is Randomness - Advertising Age - Digital