The service, called 'Rich Ads is Search', takes Yahoo! away from the standard method of text links as it fights to find some way to give it an advantage in a market dominated by Google.
'Rich Ads is Search' went through a pilot stage in late 2008, with several major brands signing on, including Pepsi, Pedigree and Staples.
Yahoo! claims the pilot resulted in as much as a 25% increase in click-through rates for participating brands.
US dogfood brand Pedigree is second from the top in the search results and has a small video thumbnail. When clicked, a larger video drops down within the search results and plays a 30-second advertisement.
US office supply company Staples shows a Staples logo next to the text ad.
Pepsi's 'Rich Ad in Search' reveals a minute-long viral featuring Bob Dylan, rapper Will.i.am and Bruce Lee.
The service also lets users search for products or a store location directly using their post code -- for example Esurance's listing lets users enter their zip codes from the results page for insurance quotes.
Yahoo! said it will offer the platform to advertisers on a pay-per-month basis instead of traditional auction style bidding, although that may change in the future.
The pilot programme has been invite-only and Yahoo! is expected to make an official announcement today.