This site allows you to upload MP3s online and create your own playlists in a community-type website, which means you can enjoy files from your home computer while at work. You can also enjoy new tunes by checking other people's playlists, and easily share your playlist with friends and family.

The site that started it all, Muxtape, became unavailable last August after legal disputes with the RIAA, but thankfully an impressive site called 8tracks has debuted a similar (if yet better) online music service.