Can bought Android apps be shared between devices you own?
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.