The phrase "announce a service" is correct and usable in written English.
You can use it when informing others about the availability or launch of a particular service.
Example: "We are excited to announce a service that will streamline your online shopping experience."
Alternatives: "launch a service" or "introduce a service".
On Monday, the company plans to announce a service called Xbox Music that will offer access to a global catalog of about 30 million songs.
The companies said that this week, they would announce a service called PayPal Plug-In, allowing PayPal users to shop with any merchant that accepts MasterCard.
Today the AOL division of Time Warner will announce a service of this type, which will be up and running by the end of the year.
This week it will announce a service that will be available on mobile phones from Nextel that also support GPS technology.
The company is set to announce a service that will let Rio users download songs from a kiosk inside a record store for a small fee.
When it comes to FeedBurner's situation, it doesn't seem to be a priority for Google but the service is not expected to shut down as long as Google doesn't announce a service interruption.
T-Mobile announced a service this week that, for $4.99 a month, automatically disables rings and alerts and sends calls to voice mail when the phone is in a moving car.
The bookseller's Amazon Web Services company has announced a service that will enable businesses to move their data to Amazon's data centers more easily than before.
Last week it announced a movie-streaming service called Amazon Video on Demand and this week it announced a service for TiVo users to buy products they see promoted on TV talk shows.
Announcing a service closure for example will create disruption, but the key is to be responsive and flexible in helping people invent and create high quality alternatives.
"Let's pray for our community tonight," the sign outside the Abyssinia Second Baptist Church said as it announced a service at 6 p.m.
