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At first glance this is just a search service, which only searches through blogs. I am not sure how it discovers these blogs. The result page lists the relevant blog entries. For each result the title as a link, the blog URL, posting date and a snapshot is shown. It seems that the entries are ordered by recency (Last post first). The fact that the posting date is something that is specific for blogs is also seen in the advanced search, which allows you to specify a date range.
What is interesting is that you can also have a look at the trends. Each trend shows the change in the number of posting with respect to some keywords. BlogPulse set up some trends of their own, but you can perform your own analyses as well. You can also investigate the top 100 of popular blog entries, links, phrases or people.
Interesting service. It surely shows that the blog search services can evolve even further. And the date of blog entry can be important metadata in order to find trends.
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