The Marvell 88W8618 is a low power SoC mainly aimed at VoIP applications. It provides a low cost highly integrated solution. Rumoured price of a board with this chip, the WiFi MAC and some ROM and RAM is < USD 30. This chip is used in the Freecom MusicPal
The chip contains the following functionality:
- ARM CPU (speed unknown)
- 802.11G WiFi
- USB interface (probably OnTheGo
- audio codecs
- http://www.marvell.com/products/voip/Highly_Integrated_Single_Chip_VOIP/release/531/ - The official press release from Marvell.
Unfortunately Marvell does not release data sheets unless you sign an NDA or licensing agreement with them (as if I would want to copy the chip).