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Ambient Devices is now offering access to their datacasting chipset (you could use it to add auto-time set, weather and other net data via radio to your device)... We've included Ambient in our "What is Open source hardware" article. It's $995, and the schematics / layout for the DATA-W1 reference implementation, as well as the RS-232 base station is on the site. Interesting, Ambient built a data network and now they're releasing hardware that can access it, before you would need to buy an Ambient device - now you could potentially get a head start on development if your device(s) require this type of data access...

The AMB-4001-W1 datacast decoder chip allows companies to embed web-configurable weather forecasts and self-setting local time into their products. This chip is the content engine behind the Ambient Devices revolutionary 5-day Weather Forecaster. It makes realtime Internet weather forecasts (or other Internet-based dynamic content) available through a simple query language communicating over a 2-wire serial port. Each AMB-4001-W1 chip is programmed with a unique serial number recognized by the Ambient Network. This allows customers to monitor weather forecasts for ANY zipcode or major city in the world, plus environmental conditions like pollen count, air quality, weather alerts, and more.