The SECOND link you posted (http://bit.ly/Z7kbNC) goes to a Group on ArcGIS Online where you should find downloadable items related to the ArcGIS Image Management Workflows. There are currently 3 items, but more will appear in the future. There is a downloadable ZIP file that contains the �??MDCS�?? script - I'll include a direct link HERE.
I suspect that the reason you did not find these items is that ArcGIS Online has a setting for "Show: Web Content Only" that you would need to change to "Show: All Content". See this screenshot:
The FIRST link you posted (http://bit.ly/Owa2D6 ) leads to the ArcGIS Online Group that shows example live image services for worldwide elevation data. This group is different, and you will have to JOIN the group before you will be able to see the items. After logging in using your Esri Global ID, click on the gray "Join this Group" button to send a request - you should be approved to join the group within 24 to 48 hours.
*NOTE - this group regarding live elevation services may be changing soon. If the link above does not work, please try Searching for Groups, and enter "World Elevation Services".
Please let me know if you still have problems or questions. Thanks!