For all the hype Android 2.2 gets, it still isn’t delivered on the flagship Android phones. It’s not even likely that phones that came out late last year will ever get the update. Even Apple, not known for extending backwards compatibility all that far, supports last year’s iPhone with iOS 4.
Droid X does run Android 2.2....so which phones are the Flagship Android phones?
Anyway did find this review at Anantech also:
A Taste of Froyo: Google Android 2.2 Explored
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Saumitra Bhagwat on 6/23/2010 1:03:00 AM
Since last year, the Android platform has seen a string of sugary, feature-filled updates starting with Cupcake (v1.5), followed by Donut (v1.6) and finally Éclair (v2.0/2.1) in November 2009. Each release has effectively addressed bugs and has introduced several new features like UI tweaks, Exchange support, HTML5 support and so on. Android v2.2 continues the tradition of the confectionary-themed nomenclature and is codenamed “Froyo”; short for Frozen Yogurt if you didn't know. The new features and improvements in Froyo aren’t exactly groundbreaking by themselves, but in the grand scheme of things, they’ve made Android an extremely refined, usable and robust OS that is a real alternative to other mobile operating systems out today. Couple this with manufacturers like HTC churning out some seriously capable hardware and you’ve got the best version of Android to date. Read on for the full review!
Android 2.2 isn't officially available on any device today. The only things floating around are leaked builds that aren't final. The closest you can get is the leaked Android 2.2 build available for the Google Nexus One on T-Mobile. It is feature complete and polished enough to upgrade as if it were final. Even AT&T Nexus One users don't have a simple path to upgrading yet - without rooting. In the coming months we expect to see the major Android devices get 2.2 (e.g. the Nexus One and the Motorola Droid) while towards the end of the year HTC users will finally be able to jump on board.
This staggered deployment is an unfortunate side effect of Google's Android customization strategy that allows handset vendors to ship with their own customized versions of the OS. While that's great for differentiation, it also means that there will be an inevitable delay between when a major OS revision is released and when it'll be implemented across the board. That being said, it is part of the Android appeal.