Of course, it depends on one’s audience, but Darren Rowse (his Problogger blog is ranked in the top 10 of Technorati) recommends writing with a conversational voice in your blogging:
This one is more of a personal preference than anything so take it or leave it - but I attempt to make my writing style as conversational as possible. I try to write in a similar way to the way I speak.
For many readers, a conversational voice is more inviting. In evaluating good and bad websites, the wiki start5696 has such a voice:
1. One of the biggest problems with a bad website is horrible navigation. If a person can’t find the links, how the heck are they supposed to use the site?
Take this site for example: http://shopping.aol.com/
Can you find where the products are to click on to buy? Because I know I sure as heck can’t!
2. Another is bad background choices. If your website causes Eplictic seziures, I doubt anyone’s going to want to surf there. Like this link here: http://www.dokimos.org/ajff/
Think you need sunglasses to use that website, wouldn’t you say?
Again, it depends on one’s audience, but the tone adds a nice touch of humor that makes reading his evaluations more interesting.