Over 60 Percent of Devices Now Running Android 2.1 or Higher

[phandroid]

It’s time to check in with the Android Platform Versions chart once again, and what as you might expect, Android 2.1 continues to grow as the dominant version of the OS. But before Eclair can even reach a two thirds of devices sitting at 59.7 percent, Froyo has increased its share of devices to 4.5 [...]

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[MassacrMan]

So why does updates come so sporadicly to different phones instead of all at once?

Something to do with phone carriers and makers I'd assume?