I know Nokia doesnt have a hardware ecosystem but it certainly has a software or apps ecosystem. This is something that alot of OEMs try to do to give their phones something differant than the competition. For example Samsung on its new Note phone comes preloaded with a Moleskin note taking app exclusive for the note. HTC has partnered up with beats audio.
But nokia has a much broader ecosytem. It has made an app highlight app to show off the best apps in the windows phone store. It has a counter app to track text messages, minutes and data used for your monthly plan, it also resets all the numbers when every month. It has a music streaming service for free, it certainly isnt as broad as spotify or zune pass but it is free and has got some good rating. Then you also have city lense an augmented reality app that shows you nearby shops and restaurants. They also have a nokia trailers app to showcase new movies that are going to be released.
Then you have the most important app Nokia drive. This GPS is as good as any out there and includes offline maps and a commute route for those who drive to work every morning. They also have exclusive lenses for people who love to use their phone camera this is curtasy of scalado, which they just acquired. http://www.scalado.com/display/en/Home
Not only do they have all those apps but they get exclusive apps made by other publishers such as ESPN, the Dark Knight, Six Flags.
What Im trying to say is if your on the edge between a Samsung or HTC phone vs. a Nokia Lumia. You might want to think about it again. Nokia is the only company getting the big apps over to the platform and they will be exclusives on the Lumia for atleast 3 months time. And besides I dont see Samsung or HTC trying to make or bring on exclusive apps for thier users.