Strangely, one of our most popular posts ever was this story from Wade on Sun taking a swipe at Microsoft on their home turf by advertising OpenOffice on the local Seattle bus routes (see the number of angry comments the story pulled, amazing).

Now, news via Blogoscoped, that Google is following suit, turning a Seattle bus into a moving whiteboard. Google scores bonus points for a nice creative idea. The image was snapped by Andrew Hitchcock.

Never one to back away from competition, Microsoft earlier created its own Blue Monster Express for CES. Sadly, no photos of this, just a visual on Scoble's post.

That's probably enough bus advertising for a new marketing blog, for now.