Slimming down iPhoto '09 by removing obsolete 'Originals'

[m021478]

I am trying to slim down my iPhoto library by removing obsolite 'Original' files, most likely via a terminal command I would guess...

I googled the topic and found lots of instruction for previous versions of iPhoto, but wanted to check to see what the proper way of doing this would be for iPhoto '09

Here are some other web pages I've stumbled across that offer solutions, only these solutions are supposedly for past versions of iPhoto:

http://www.macosxhints.com/article.php?story=20060529133344872

http://infinite-sushi.com/2007/02/slimming-down-iphoto/

Anyone have any idea how to properly use the terminal to slim down my iPhoto Library by deleteing obsolite originals?

Thanks!