Visiting http://buzz.google.com from my G1 shows a table of compatible devices (and operating systems). When looking at the list, the first reaction is YAY Android gets all the functions.  Second glance, and you realize Android 2.0+ gets all the functions. Furthermore, there is no mention of pre-2.0 devices. This leaves me with the assumption that the support will only come with Google maps and not through the browser.

The issue as I see it, is that Google is segregating the OS instead of building an app for use on all android devices. As a G1 owner, fan-boy, it might come off like I am screaming UNFAIR.. However, my G1 is well past its life expectancy, so I can cope. The greater issue is that devices are still being produced, and developed on earlier versions of the OS.  for instance, the Sony x10, releases next month on 1.6. A long with a handful of other devices, the Sony will arrive to the market behind the times and possibly missing support of future Google Services.