He did--he called out Rdio (http://rdio.com) as an example.

Presumably that is the only one. Xamarin features it, but everything else they feature is an in-house corporate line of business app. If there are 'lots of great apps' out there, you'd think they'd tell us.

Not encouraging.

Well, right now I have just built two "in-house corporate line of business apps" and so far, the pay was reasonable and time-savings due to underlying framework huge :)

That's fine - the point is that in those cases the end-user is not the customer, so cost-savings trump user-experience.

There are some case studies here: http://xamarin.com/customers