"Sharing the content without actually hosting it" is usually pretty easy with the special embed links offered by the sources themselves.

On the other hand, every service has a different code which makes it a challenge if you're embedding from multiple sources.

Embedly is a free API service which can embed from 100+ content sources with a single API.

Within a single call, it can include single or multiple URLs and supports video, images or rich HTML.

The service uses the oEmbed spec., has code samples for various languages and a plugin for WordPress.

Flabell is presenting a beautiful & free Flash Mp3 player that can display multiple artists & playlists.

Every aspect of the Mp3 player can be customized via XML including size, colors, speed and transition effects.

It streams the songs so there is no need to wait until the file is totally loaded. With a click, you can shuffle the songs.

And, a great feature is the share/embedding support. If enabled via XML, anyone can easily embed the player to their websites.

You can use the Flash Mp3 player directly on a website or integrate it to your Flash project by moving some ActionScript files and dragging the movieclip containing the Flash player in your Flash file.

The player comes with the source code including .Fla files, fonts & PSDs.