This might surprise you.
Because the single most critical element in a successful corporate blog pitch (or almost any business marketing project) isn't a killer PowerPoint presentation.
Or an animated Flash demo.
Or even a heaping pile of head-turning statistics.
It's a Champion.
What's That?
A champion is someone inside the organization willing to help you navigate the maze of fiefdoms, departments, politics and turf battles which infest most corporations.
They make sure your pitch gets in front of the right people (and stays there). They keep your pitch moving forward. And they can smooth over the little hurdles and misunderstandings which often derail good projects.
Think of the corporate pitch process as a minefield. Your concept is sound, the numbers are good, but without a guide through the minefield, your odds of success are low.
How to Find a Champion?
If you don't already have a contact or champion within the organization, you'll have to look for one. I'd suggest making contact with a couple of likely job titles (suspects), and see who responds.
Your insider needn't be a VP. In fact, mid-level technical, marketing & PR people often have surprising pull with their bosses, and they're far, far easier to reach than Director/VP level people.
So before you simply aim your proposal high up the corporate food chain, devise a strategy (lumpy mailer, unique offer, information hook, etc) that puts your idea in front of several potential champions.
See who bites. Keep them motivated. And let them guide you through the corporate minefield.