Yahoo! WebPlayer is a fresh web-based media player from Yahoo! which can be integrated into any web page with just inserting a line of JS code.

It has support for many media formats including MP3, WMA, YouTube, Yahoo! Video, etc. and works automatically by scanning the related links/files in a web page and inserting a "play" button besides each of them.

Once the "play" button is clicked, an in-page  (can be a good way to keep the users in the same page) and good-looking player appears with a nice slide effect that plays the media either in a tiny audio player or a video player.

The player can even detect related media itself and link to them if the "term detection" mode is enabled.

The API for the player is under development and it'll offer much more flexibility once launched.

P.S. You'll remember the popular Yahoo! Media Player, WebPlayer is actually the next-generation of this product.

Sockso is an open source music server application that lets you share the music files easily with everyone.

With a very simple setup, just running an executable file, the environment is instantly ready.

The aplication is managed from a Java GUI. User can connect through a web-based interface and:

• create playlists
• listen to the music via a Flash-based player
• download tracks, albums or playlists
• upload new music files & more.

Sockso supports MP3, OGG Vorbis, Flac, and WMA files, If needed it can re-encode output streams to save bandwidth. To see all the features of the application, click here.