Blubster is a peer to peer network with a new private protocol that works without a central server. Once your client program connects with another client you're free to search and download Mp3 music files from the entire network of users.
Blubster features an easy to use interface enabling fast searches, fast & resumable downloads and cache files at several sources, chat & voice chat and much more!
Search for an MP3 song and Blubster will get all details of each search result, including quality, length, fingerprint... You can then choose which file to download. If you try to download a file you already own you can choose to resume, overwrite, rename or even cancel the download.
When the download begins Blubster can optionally check fingerprints in order to download from multiple machines. - Blubster.com