I don't want be an alarmist but I have my doubts about this opt thing yet.

I am concerned because:

• *Some* of the Qt4 libraries are going to be installed to /usr/lib [1]
  
  People will develop in Qt more and more, so there will be popular Qt applications, and the users will want to install them. If they depend on (for example) libqt4-svg libqt4-opengl libqt4-webkit libqt4-gui and libqt4-network, almost 40MB of / will go out.

• It isn't decided yet if Python packages will use /opt (hopefully) [2]
  The most useful python libraries will use ~30MB

But plans could change, so take it with a grain of salt.

[1] https://garage.maemo.org/pipermail/q...er/000872.html

[2] https://garage.maemo.org/pipermail/p...er/000940.html