In what is being billed as the world's largest combined digital radio network, AOL and XM Satellite Radio have joined forces to launch a new online radio service that will bring 70 XM channels and AOL

In what is being billed as the world's largest combined digital radio network, AOL and XM Satellite Radio have joined forces to launch a new online radio service that will bring 70 XM channels and AOL's already streamed 130 channels, free to subscribers of AOL.com.

The as-yet-unnamed initiative will also offer a premium, for-pay service available to Web consumers that are not AOL members. The offering, expected to roll out this summer with AOL's next-generation Web portal, could draw 100 million consumers online, the companies say.

In addition, XM will integrate AOL programs Radio KOL, AOL Music Sessions and AOL Music Live into its satellite service. The companies will also work together to develop new programs and services for online and satellite.

AOL CEO/chairman Jon Miller called the deal "a giant step in digital media," while XM president/CEO Hugh Panero said, "Our philosophy has always been to work with strong partners at every level: retail, automotive, and now online to build awareness and subscriptions for XM."

To give consumers a taste of the new service, 20 XM stations and 130 AOL radio stations will be available free online in the coming months.

AOL and XM will co-promote their programming across their networks. XM currently has nearly 3.8 million subscribers while AOL claims more than 100 million unique monthly visitors across its network of properties.