I have an 1st gen iPod Touch and an iPad 2. The iPod Touch is obsolete enough that most new apps won't run on iOS 3.1. Also, there is a growing number of apps that I own and use daily that have updates that the Touch can't run.
I sync my Touch with iTunes to keep my podcast library up to date. My iPad syncs with iTunes via WiFi.
I use several universal iPod/iPad apps. If I update one of these apps to a version that my Touch doesn't support (because the app now requires iOS 4+), the Touch loses that app. When I try to turn off app syncing for my Touch in iTunes, iTunes warns that it will delete apps and their data on the device. That's not what I want.
How can I sync my iPod Touch with iTunes to keep podcasts up to date, but keep the older versions of the apps around for the Touch and use the latest versions of the apps on my iPad?