In discussing mobile radio service Slacker a few weeks ago, Pandora cofounder Tim Westergren told MP3.com that his company was "not sitting idly by" in trying to untether Pandora from the PC and get its music recommendation engine in front of as many people as possible.

Tim Westergren

In two deals the company is announcing tonight at an event at the San Francisco Museum of Modern Art, Pandora is doing just that.

The first deal is with Sprint, placing the Pandora service, without advertisements, on all Sprint Power Vision phones by the end of June. The service is available on five Sprint phones today, and will be available as a free 30-day trial and then for $2.99 per month added to Sprint customers' monthly bill.

The second is with Sonos, maker of wireless digital music systems for the living rooms of audiophiles. The deal will allow users of Sonos' systems to simultaneously stream up to 32 different Pandora radio stations to as many as 32 different rooms or one station to all rooms. The service will be available for a free 30-day trial, and then for $36 per year.

Pandora's new Web interface

"This is a big, big piece of the puzzle for us," Westergren said today. "This is a whole new kettle of fish for us. Right now we are .1 percent of the radio listening audience in the US. We want to be radio with a capital R. Everyone owns a cell phone, so we're heading in the right direction."

Pandora also unveiled a new interface for its Web-based service.