I just picked up a set of the Logitech Z-680s for my G5 and they kick ass for iTunes and DVDs. What I can't figure out is how to reliably get other system sounds out of the speakers. For some reason when I play iTunes it comes out both the internal speaker and the Z-680s. iChat and Safari work the same. However, I don't get any sound when Mail comes into the Mail.app. or with any Finder sounds (like emptying the trash, dock poofs, etc.)
What gives?!?