Neither Jango nor Radioairplay are frontrunners in their field - Tunein and especially Pandora have 10x registered users and a greater number of unregistered users.
It looks like they've been editing the NeuCoin site and wikipedia a lot but one of their earliest claims was NeuCoin would have 1 million users within a year, when Bitcoin itself only has 100,000, according to the Federal Reserve, to 250,000, according to Jeffrey Robinson. In other words Kaufman thinks he can attain 10x more users than BTC within 12 months (even though his current forum appears to be a ghost town).
Jango and Radioairplay together, if there is not an overlap in users, is only around 14 million freemium users (meaning at least 97%+ does not pay for anything) and if he can really get 8% of them to adopt NeuCoin then Daniel Kaufman is in the wrong business - he would be making $10s of millions doing seminars on freemium conversion because that accomplishment would be like selling ice to Eskimos or Oxygen to 1 billion people on earth.
As far as I know, Neucoin's plans involve developing partnerships with other existing websites. Jango and RadioAirplay are more to be used as Proof of Concept during the initial stages of the coin. They plan to use Jando and RadioAirplay more to test and optimize and iron our any initial bumps.
I think Neucoin is a fantastic experiment. Whether it succeeds or not is something else. Also, it is not very impractical to aim for 1 million users in 1 year. It is very possible for a new coin (whether neucoin can do this obviously remains to be seen) to gain that sort of a user base in mere weeks if the coolness and social factor really takes off. In these days of intense social engagement, 1 million users is mere pittance.
So if I'm an "other existing website", what's in it for me by integrating Neucoin?