An easy web look for Google's main blog shows that you can find it at blog.google.

A blog is often wrapped up in a component of the website called the newsroom, yet it normally works in similar way as a blog. For example, the Facebook Newsroom is Facebook's blog site, though they also have Facebook Media Blog site for media partners.
http://zanderbhda063.iamarrows.com/the-top-reasons-people-succeed-in-the-internet-blog-industry