Google does it again, it has just released a Blog search tool that will limit its searches to only blogs. Blogger had a dashboard previously that only limited itself to the Blog spot domain and nothing beyond so technically this engine now covers the entire blogging world and can be used to keep track on the minute-to-minute evolving nature of the blog world.
Previously I have used Technorati which over the past month was getting quite slow due to over usage but now I feel that Google Blog Search can do a faster and far more comprehensive blog search. It might come in use if you choose to limit your searches to blogger comments on various items on interest.