[fpgeek]

Do you seriously think Amazon and B&N aren't internally running the publicly available Compatibility Test Suite (see: http://source.android.com/compatibility/cts-intro.html ) as part of their regular testing?

Given the wide variety of applications shared amongst the three markets (plus the successful installation of Google services including the Play Store on both), I think there's zero evidence that, from a developer's perspective, the Nook Color/Tablet and Kindle Fire are materially different from any Google-blessed Gingerbread-based tablet with the same specs, except that the Google-specific libraries and services are not installed.

I can understand compatibility worries about cheap, no-name non-Google-certified tablets, but that doesn't describe the Kindle Fire and Nook Color / Nook Tablet. The cheap, no-name tablets (and other devices) aren't a big part of the market outside the developing world. And the developing world is a whole different ball game for all sorts of reasons, not just Android device compatibility (e.g. the most significant competing platforms are Symbian and, arguably, SMS).