There are also the usual suspects in this market: the Slim Devices SqueezeBox , the Roku Labs SoundBridge , and Sonos system. All three include wireless support as well as wired connections. I've got a Roku SoundBridge M500 (reviewed here ) and while the firmware support is sometimes slow and some of the software used on the PC side can be quirky at times the convenience factor is certainly significant.

Ethernet connectivity for setup and firmware updates is likely to creep into receivers and processors, but I suspect that the most robust media clients will remain standalone products.