I like Scoble's "engagement" idea, but I see no good way to measure it:

I’m trying to come up with new ways to measure audience that goes way beyond whether someone downloaded my content to their machine. I have tens of gigabytes loaded here that I haven’t watched or listened to, and I bet I’m not the only one.

I’d rather go with engagement than just downloads. I believe advertisers will eventually get wiser and pay for audiences that’ll do things, not just download files with an automated client.

There are onerous methods, of course - the "phone home" kind of monitoring. No one wants that, so what else is there? All I can think of are indirect measures - emails sent as feedback, comments left on the posts, that sort of thing. Not exactly enough meat for advertisers to sink their teeth into. It's a good question, and I wish I had an answer.

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