Yet another official blog from Google, this one for Google Talk. When we gained the Google Base blog, I wished for Google to give us an all-in-one feed. Philip over at Google Blogoscoped was feeling the same frustration, and he solved that by creating a web page that unites them all. The only problem is, you can't get a feed of everything that goes onto that page. Hopefully, Google itself will come up with that unified feed.
Postscript: Philip's created a feed now, which you'll find here.