On the issue of 'I have this super helpful service that could change people's lives--how do I get it to them?', well that's what I used to get the big bucks for from clients - and to whom I'm increasingly saying 'Hang on to your money - I don't have the answers any more.'
As you'll likely know, it's increasingly a tale of 'do what you reasonably can with the usual ways of getting the word out' - but with increasing chance and decreasing return.
What I'm certain of is that the key is more specific targeting - 'rather have five strongly-in-favor I-love-this-stuff users than five hundred 'that's interesting' casual readers'.
But that's alien to many, who'd rather spread far-and-wide than be more selective.
Specifically with BTR, I've always considered it too generalized. (Sure, the web is generalized, but that's an exception.) There's simply too much stuff there with little distinct identity. It's just a mess - among which is good stuff.
It's similar to an Amazon of audio programs - and it doesn't work well for either the listeners or producers. Niching will help - the concept of Biznik Radio is good, but wasted in the current expression. It'll benefit from more content, and hosted elsewhere. But even Biznik Radio is too generalized in some instances.
Another big issue with BTR is the 'dullness' of the presentation - if the term 'radio' is in play, then we have expectations of it sounding appropriate. It needs the jingles, sweepers, idents and other stuff to work. Oh yeah, and music - even on talk-oriented radio. Er, make that especially with talk-oriented radio produced by people who aren't radio professionals. And BTR doesn't do that. Like Odeo, it's simply a catalog to browse.
Flip that around and make it more radio-ish... and broadcast a stream which features individual programs which can be accessed on-demand and things become more interesting. Add the pro-tech stuff and it steps up a notch. Blend-in music and game-on.
As an example, and I can't do this in any way other than a plug, consider InnerpreneurRadio (don't bother clicking the link, there's just a holding page for a currently inactive project), the basis of which is:
'Talk good business. Play great music. Period.'
Innerpreneur Radio covers the best of Innerpreneur-oriented business & living… blending news, commentary, interviews, features, advice, tips, etcetera with music drawn mainly from 'The Rolling Stone 500 greatest songs & albums of all time.'
Then we broadcast it, globally, via the Internet. 24-7-365. Free.
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Jeez, this was longer than expected. I don't want to be whoring myself in a public forum, so I'm happy to continue this privately for anyone who's interested.