Susan Solomon wrote and interesting piece for MarketingProfs.com—Don't Bore Me With Your Blog.  Funny, she started off like this:

Blogs are beginning to bore me. Not all blogs, but many are getting on my nerves. And, believe me, I'm not a teenager with the attention span of a gnat—I'm the mother of one, and you can bet he has no patience for most blogs either.

Then chides that it's that kind of writing that makes blogs boring.  No, that's the kind of writing that draws people in.  Blog are all about being more informal, a little more chatty.  She goes on to give, though, some excellent tips on writing blogs:

• No passion, no blogging: Don't think about starting a blog unless there's a passion for your topic. Your blog will wither and die when there's no fire for writing about new and breakthrough ideas. Passionless blogging leads to bored readers and, as we all know, bored readers vanish in a click on the Internet.
• Take risks: A blog is not a buttoned-up corporate newsletter. Invite comment and even some controversy. Don't be afraid to begin dialogue on an issue that may prompt a different opinion. Good blogs invite interesting conversations.
• Find your tone: Corporate writing is different from brochure writing, which is different from Web writing, which is different from blog writing. Nick Usborne taught us how to write for the Web. We also need a course in blog writing, which in my opinion means offering a personal perspective without excess chattiness.
• Break from the pack: One problem with blogs is that they tend to link to the same sites and regurgitate the same news. Offer something new by channeling your inner news reporter. Strive for the scoop.
• Be topical: Unless your blog is on Jane Austen (and I'm hard-pressed to find a business blog tackling this topic), relate entries to current themes. You can create your own energy off the current "buzz."
• Know your audience: This adage from Marketing 101 still sticks for bloggers. There are literally too many blogs and too little time to read them. Only post items relevant to readers. How to gauge what's relevant? Consider those postings generating the most comment.

Great advice, but in following "find your tone" and "break from the pack" you might find you are being chatty.  And your audience might love it.  Mine certainly does.  Sure, I'm serious sometimes, but I certainly know my audience and my topic area.  Passion?  Gee, does it show that I love blogging?  All these things make for great content.  So, follow Susan's advice, just not to closely.  Have a chat, it's fun, trust me.