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Yahoo is expected to announce the acquisition of BuzzTracker, a news aggregation site, for a reported figure of $5 million. BuzzTracker has been in beta, and when it eventually emerges from that status, it will be as a Yahoo property.

Kara Swisher at All Things D said Yahoo should disclose the purchase of BuzzTracker today. A price hasn't been announced, though Swisher cited sources close to BuzzTracker owner Participate Media as saying the check will be around $5 million.

BuzzTracker aggregates items across over a thousand topics from 90,000 blogs. They generate news pages for those topics. Integration with Flickr and YouTube gives them pictures and videos to display that match the topics in question.

Swisher suggested that Yahoo made the BuzzTracker deal when the price of similar services got too rich.

"Yahoo had looked at other better-known competitors in the space, said sources, such as the San Francisco-based Sphere," she said. "But those trendier (and more popular) startups apparently had too lofty valuations."