There is a big difference between a new (so-called must-have) skills and essential skills. All knowledge that you really must have is already developed long ag

There is a big difference between a new (so-called must-have) skills and essential skills. All knowledge that you really must have is already developed long ago (look at things like SICP or Mythical Man Month, or XP Explained) and remains unshaken. In contrary, this or that new cool tool to make a dynamic web-pages, or a brand new pile of a useless abstractions in the next revision of J2EE or .NET are third-rated knowledge. Google search is enough in this case. Take a look at Berkeley's CS 61A course (with that honorable old-school lecturer and a nostalgic 80x24 text-mode console on Solaris 2.7) - all the essential knowledge is here.