Yahoo Sports,Yahoo Movies, Yahoo Music, Yahoo TV, Yahoo omg!, Yahoo Gamesand Yahoo Weather have all been changed, with the new, cleaner design aesthetic present in Yahoo's weather app. It demonstrates Yahoo following a similar path to Apple in "flattening" their design, to make it clear and simple and easier to use.
The biggest change has been to the Yahoo Weather page, which now displays hi-resolution images from Flickr and gorgeously presented data.
Yahoo have also announced they will be releasing a new logo on September 5th, and 99Designs ran a competition for its users to re-fashion the logo in whatever way they liked. The results were pretty impressive, and you can see the winning entry and others here. For now, the Yahoo logo is changing daily before it finally changes to the official logo in September.
The winning Yahoo logo design