Cannot turn off background data
After upgrading to 2.2, I've discovered that its not possible to disable "Background data". This was useful in that it prevented all the apps from trying to sync, send and receive data in the background.
From my tests, turning this off / on / off did not help. Task manager shows that there are a whole host of apps that just keep running in the background. Even if you kill them, they keep restarting on the back side.
Also, Android Market will not run if "Background data" in "accounts & sync" is not enabled.
The downside to this is that, this "feature" is not going to improve battery life.
Seems that the upgrade to 2.2 wasn't worth it considering it really only helped to reduce some of the jerky screen refreshing when scrolling up/down.