It might sound like it is a blog that belongs to Google but it is not. There is a blog called Googlesblog.com that has no affiliate with Google at all that allows guest posts.
Since last night I have put two blog posts already and I am intending to put more.
The blog posts I have put are
Self Storage Industry Takes Full Advantage of the Web and Offline Marketing to help SEO.
If you want to promote yourself, I think this blog can help you do some guest posts but please don't spam it so its owner doesn't take away the guest post writes.