In continuing with my quest to experiment with the vast possibilities of what Photoshop can do for my photos, I've found more great tutorial sites, yoohoo!!
So far, I've learned the basics of layers and sharpening photos (yeah I know I'm crawling... at one thousandth of Photoshop's potential, hehe). The most fun tutorial was on Selective Sepia (photoshoptutorials.ws), where you can choose to highlight a specific color in a photo, while the rest turns gray.
In this photo, I've attempted to highlight red color only (without Overlay)... while the yellow turns gray:
Here's the original picture: