I think it would be neat to be able to upload audio to the hubpages. For someone like me who does voice overs, it could help a lot. Also, in the forums, I think it would help if everyone could "favorite" certain hubs and know when there is a new post.
I wouldn't have a problem with it, provided there was NO option to have it play automatically. That's what's loathed.
A huge proportion of internet users are online at work, and don't want their boss to know. If they open a site and their PC suddenly starts blaring music, they'll click away from that site pronto and never go back - so you've lost a reader.
For someone like you who does voiceovers, you should give youtube some serious attention. It doesn't have to be video footage, but still shots. And you could your point across.
Is there a site like Youtube that allows people to upload mp3s for streaming audio? If there is then suggest that to HubPages to implement like the Video Capsule. That way HubPages don't have to store the files or burn up the bandwidth.