Copying applications between phones? Is it possible to easy copy applications between phones (eg. two HTCs via bluetooth) and get them running fine? Or apps just need to be downloaded from AM each time because of some installation routine that comes right after downloading?
Android 2.2 introduces the App Sharing app which is installed by default. I think this might be what you are looking for, however you will need a FroYo device. 

For earlier versions you could use the app "Bluetooth File Transfer" to share the APK files, if you have these available on your memory card for example.