Amit Agarwal of Digital Inspiration has come-up with this, which will "Turn Google Talk Into an Internet Radio Station Without Any Software; Play Live Music from your PC".
How will this help? You can do the following with this:
"1. Play that huge song collection on your local computer using any media player like iTunes or Windows Media player and stream that music live to your IM buddies.
2. Send MP3 songs as voicemail to any of your contacts in GTalk that they can download as MP3 or directly play via the Google MP3 Player in GMail.
3. Dedicate a music video on Youtube to your valentine and it will stream live to her computer as audio via Google Talk."