With all the snarkiness going on around Dell's entry into the blogosphere and the subsequent reaction (and even more reaction)... a bit of perspective might be required.
Mistakes by silly interns aside, let's keep in mind that (as I commented on Kevin Dugan's excellent blog) reputation does not change overnight, or with the arrival of a single blog. Like any other relationship-building exercise, it takes time, engagement, and a degree of trust built between the parties involved. What we forget is that these are real people writing here... it's not the corporation.
Put it another way: starting a blog (corporate or otherwise) is - from this uninformed male's perspective - like giving birth. It's usually painful and what emerges rarely has any identifiable personality. But nurture it, help it grow, give it time, and it will develop personality, good habits (hopefully), and an ability to socialize with others. It might even become your friend.