I often have to print layer comps to show as a story board and It would be so great (and a time saver) to be able to print selected Layer Comps. Maybe a button in the Layer Comps window next to the < > arrows that is a print icon. When clicked, it will print only the highlighted layer comps.
I'll absolutely second this!
It might be possible to achieve this with a Script (probably would have to include a dialog for LayerComp-selection).
So you could ask in the Photoshop Scripting Forum if someone either already has a Script for this or might be able to help you.