A computer user basically uses a computer to do the following:
  1) Surf the web, 
  2) Check email, 
  3) IM chat, 
  4) Download/purchase digital media files,
  5) Manage/share your digital photos,
  6) Watch movies,
  7) Play games, and
  8) Author documents, spreadsheets, and presentations.<p>Anyone who does more with their computer than the above and isn't afraid to tinker with the operating system or install/remove programs usually considers themselves a "power user". One thing I just realized is that all the things a "Power User" does in a Windows or Linux environment as compared to a regular user is trivially easy to do in Mac OS X, to the point where the distinction is meaningless.