CNET Networks and Yahoo announced today what they term a broad, three year strategic partnership that includes content, advertising, and search marketing components.

Under the partnership:

CNET.com will provide technology content, including news, product reviews and original video, to Yahoo Tech and Yahoo News. The agreement significantly expands the technology content currently available on Yahoo, and will include hundreds of monthly news stories from News.com, as well as hundreds of CNET.com product reviews.

CNET Networks will be able to sell ads to its own audience on Yahoo properties, giving its marketing partners the ability to efficiently and effectively scale their marketing programs across CNET Networks and the Yahoo network;

Yahoo will be able to sell display advertising inventory across CNET Networks including BNET, CNET.com, GameSpot, TV.com, and CHOW.  According to the press release, Yahoo!’s marketers can leverage the publishing channel to reach their customers within CNET Networks’ category-specific areas.

CNET is also agreeing to distribute Yahoo‘s toolbar through a newly constructed program at CNET Download.com.