Number 10 seems to be the magical number in software technology. The web site you are now viewing, is the 10th version of my web sites and I can say, of course, that this is the greatest of those ten.
Also in many big software companies the number ten seems to be something good and many try to get their software quickly to that version. In some programs, the version ten is really worth of all the experience that it has had in the past nine versions. Like for an example Macromedia Director 10 or Mandrake Linux 10, when Microsoft Windows is still something like 5.1.