Google has quietly disabled the Google Blog Search home page at google.com/blogsearch and redirects it to the Google home page. Now, if you want to filter content based on blog posts, you can do so by going to Google News, clicking on the Search Tools and selecting the “All news” drop down and checking off just “Blogs.”
Here is a screen shot:
It seems like blog search has been slowly dying off but with this change, it might stick around for some time.
Again, Google Blog search seems to now be incorporated directly into Google News as a search option.
Hat tip to seo-united.de