Media receivers are becoming mainstream devices for everybodies home multimedia infrastructure. At prices below 200USD it became affordable. Those low-cost devices rely on a PC in the network that hosts the media files like MP3, Video etc.

Sony offers for instance the RoomLink PCNA-MR10 media server.
The RoomLink™ Network Media Receiver from Sony is a device that works with your VAIO® PC to enjoy all video, photo, and music content on your home entertainment system.
With the optional Ethernet Converter (PCWA-DE50), you can enjoy digital entertainment from your living room without the hassle of wires.
Order The Sony Roomlink at Amazon.com

Sony is not alone in this market, here are three more media server devices:

HP Digital Media Receiver EW5000 -Automatically gathers music and pictures from multiple networked PCs - Remote control displays pictures and sends favorites to a PC-connected printer -Multiple receivers can communicate and control each other - Standard wired Ethernet and WiFi 802.11b compatibility - Supports 64-bit and 128-bit encryption supported, ad hoc & infrastructure modes

Motorola Simplifi Wireless Digital Audio Reciever -Send streaming music and news content wirelessly up to 150 feet, even through most walls and floors -User-friendly display and wireless remote with multidirectional buttons makes navigating channels, playlists and tracks a breeze - Tag It feature helps you to learn more about songs, artists, and buy CDs, concert tickets and more

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