Embedded Sitelinks Launch In the next two weeks, Google will be launching a new display format of Adwords Sitelinks, called Embedded Sitelinks.

The rest is here:
Google Adwords Announces Embedded Sitelinks Launch

Popularity: 5% [?]

Today Google released the +1 button for organic search listings and AdWords which allows people signed into Google to recommend websites to friends and contacts within their Google social network.

See the article here:
Breaking News: Google Launches +1 Button Social Search

Popularity: 6% [?]

Way back in February I first mentioned the Search Alliance between Yahoo and Bing.

Go here to see the original:
Official: Bing Now Powering Yahoo Search Results

Popularity: 1% [?]