For myself a true understanding of sharpening (inc. when/where it's not needed) at all stages in my workflow, from RAW to printing has contributed greatly to my own photography (that's using PS - lightroom doesn't cut it for big prints IMHO)What type of processing techniques are you talking about? Like stuff beyond what you can do on Lightroom? I want to get really good at postprocessing and will take all the advice I can get.
A couple of articles about the importance of print that I've put together that might be of relevance?
Printing your photos is a useful skill. 5 steps towards making great prints that will help you improve all of your photography
Why do your photo prints not look right? From prints too dark, and prints not matching your screen, Keith Cooper looks at ten of the most common reasons that prints don't work