Google started a new blog for coders yesterday: the Google Open Source Blog (with associated Google Open Source Blog feed of course).
It's a spin off from the Google Code blog (which continues to develop apace e.g. with news of the formation of Google Technology User Groups). It's dedicated to, you guessed it, open source software / code and open source developers' projects hosted by Google. There's only one post there so far, but no doubt there'll be more soon.
It's so new it hasn't even been added to the feeds or webpages for combined Google blogs or combined Google developers' blogs yet.
I've added this blog to my custom search engine for all Google English language blogs and search engine for all Google dev blogs.