New Audience Metric Needed

I was just reading the latest Ze Frank/Rocketboom dustup and she's right, we need to measure stuff other than just whether a download got completed or not. She says we need a "likeability" stat. I think it goes further than that. There's another stat out there called "engagement." No one is measuring it that I know of. What do I mean? Well, I've compared notes with several bloggers and journalists and when Digg. How many people hang out there every day? Maybe a million, but probably less. Yet if you get linked to from Digg you'll see 30,000 to 60,000 people show up. And these people don't just read. They get involved. I can tell when Digg links to me cause the comments for that post go up too. So, why should engagement matter to an advertiser? Well, as an advertiser I want to talk to an audience who'll actually DO something. Yeah, I'm hoping to get a sale. Yesterday Buzz Bruggeman CEO of Active Words, was driving me around and told the story of when he was in USA Today. He got 32 downloads. When he got linked to by my blog? Got about 400. My audience was (and is) a lot smaller than USA Today, but the engagement of the blog audience got his attention. How could we measure audience engagement? Is this something that Comments Add to Del.icio.us | Digg | Reddit | Furl Bookmark Murdok: Scobleizer blog. He works as Scobleizer