Although Ask acquired the popular Bloglines, today, the company is rolling out a new blog and feed search capability on both Ask.com and Bloglines.com sites.
Unlike many blog search services, which sort results with the most recent posts appearing first, Ask Blog & Feeds search lists results by relevance. You can re-sort results by date or popularity by clicking a link.
When sorted by relevance or popularity, a dropdown menu lets you further refine your results, displaying results from the last hour, day, week or month.
One of the nicest features of the new service is the ability to preview results before clicking through, using the "binoculars" feature similar to that found in Ask web search results. Ask is also offering an advanced search for blogs and feeds. This opens an Ajax-like dropdown below the search form with additional feature such as Boolean search, a more precise date search, and the ability to search for posts written in specific languages.
Source: Search Engine Watch