Yes this poll needs an other option.
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Maemo apps are going to the Ovi store, then these need to be the best of the best. There's no point in the Ovi Store playing the role of yet another application manager, and there's even less a need for developers to push their wares to two Nokia venues.

If anything, apps from Maemo that are at a major version, have no show stopping bugs, and highlight the platform (Fremantle All Stars or something like that I once heard of) would do well there.
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In terms of the other way around, Ovi Maps, Ovi Chat, Gravity, MWS, QuickOffice, Google Maps, and Nokia Friend View would be all solid Maemo offerings - if accessible from the Ovi Store.

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EDIT: Qt apps work equally well right now for Symbian and Maemo right? Given the screen resolutions of S60v5 devices, there just might be a whole lot of inerplay between the platforms in terms of apps, making this not just very possible, but the most likely direction consumating in the next Maemo and one of the next 2 Symbian releases.