I have ordened the -to my opinion- most interesting candidates for further research here:
* http://wi-ca.org/Drupal_translation
* http://wi-ca.org/Drupal_multi_language
It's about selecting modules that possibly could serve most for a complex multi-language site. I've left out some modules in the pre-selection.
Yes, there should come a wiki for the translations group, but maybe in a different form than I did (as I for example already have left out some).
Then in that wiki some explanation why one should use this module for something and not the other one?