The British Radioplayer project is set to launch on the 31st of March, offering access to 150 stations.
The project is a collaboration between commercial radio operators and the BBC to provide a one-stop online player to provide access to "the vast majority" of the nation's radio stations.
Between 200 and 300 services are expected to become available within a few weeks of the launch at the end of this month. The Flash-based application will also provide access to on-demand programs and podcasts.
All BBC listen-again shows available in the iPlayer will also be made available in Radioplayer.
Since the initial version of Radioplayer depends on Flash, it's only going to work on mobile devices that support Flash. The group after the launch phase it would consider mobile applications.
The iPhone in particular is likely to be a prime target given the platform's inability to run Flash content.