How can I copy key frames from one armature or bone and get them into the other armature or bone??
Know how to use the IPO editor? Select the bone you want to copy from, then go into the IPO editor. In the IPO editor select the keyframes you want.
On the bottom right in the menu of the IPO editor are two button (arrows) pointing up and down. These are copy and paste. Click on the left one to copy.
Go back to the scene. Select the new bone. Go back into the IPO editor. Select the IPO channel you want the keyframes on, then click the right arrow to paste.