Hi!
An excerpt from the announcement (http://groups.drupal.org/node/3546):
"The extractor.php file sat there in the translation templates project waiting to get criticized to death for being hard for beginners and even people experienced with Drupal. Fortunately Raimund Bauer come along to actually disturb the waters and start to build a web based interface on top of the extraction functionality. For maintainability reasons, this resulted in the extractor.php script getting move to the resulted project..."
Read on there for more information! Please test and provide suggestions and ideas about how a web based extractor should work (I don't think the current interface is ideal).
Gabor