Corroborating the Android Platform Dashboards
doubleencore.com
doubleencore.com
If you are making a general purpose app, you might have to deal with a higher % of Gingerbread users today. My gut feeling is that we are 6-12 months away from being able to make ICS the minimum for most apps.
The difference between 15% and 1-2% still means that I have to support Gingerbread today, but I spend a lot more time finding ways to take advantage of Jelly Bean than figuring out how to backport to Gingerbread. Skate where the puck is going.