I did a thread on this before a while back...anyways, the Buran thread got me thinking on how the OTL Space Shuttle was in many ways a dismal failure which managed merely to keep human spaceflight alive for 30 years. A significant accomplishment, yes, but much less than it was originally sold to do. So, AH.commers, how would you improve the shuttle so that it can come closer to its initial promise? How would you make it an economical and successful space launch system? How would you avoid its flaws?