When you're finished developing a trunk and want to package it up for release, you make a tag.

svn copy https://prime/client/tfg/project/trunk \\
    https://prime/client/tfg/project/tags/1.0 \\
    -m "Project: comment"

Atleast that's what we're doing ;)

Also, when you want a clean version of your software (without the .svn hidden directories) you can use svn export.

svn export https://prime/client/tfg/project/tags/1.0 project