We heard you. In the latest release of Photoshop (CS5) you can now select multiple layers and adjust the opacity at once. Other little tweaks you might enjoy such as option to not include "copy" when you duplicate layers, or you can now not Save As to original folder are described further here: http://blogs.adobe.com/jnack/2010/04/photoshop_cs5_whats_in_it_for_designers.html
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