Can bought Android apps be shared between devices you own? On the iPod Touch/iPhone, since it is tied to your iTunes account, I am quite sure you can have your bought apps on multiple devices you own (can't test though, iPod Touch was stolen).

However, now I have the Motorola Droid, and am waiting for a tablet, and am considering getting a Nook and rooting it to run my own apps.

Question is, if you buy an app on the marketplace, how is the security done:


Is it tied to your Gmail account so you can share it between devices you own?
Is it tied to the device? (Don't break/replace your phone!)
As long as it's installed, you're OK? (If you uninstall, or wipe your device, it's gone).


I assume 3 is highly unlikely, though a possibility, so leaving it here as a potential answer to my question.
On your phone open the Android Market app, press Menu, then select Help, then choose Troubleshooting (under Users), you should now see the "Retrieving previously purchased apps" headline. This says:


  Your application purchases are tied to
  your Google Account and can be
  installed an unlimited number of times
  on any device.
  
  ...
  
  If you change devices, you can install
  previous purchases by making sure you
  sign into your device with the same
  Google Account you used on your
  previous phone.