Can anyone suggest a PS7 tutorial site that can explain in easy to understand terminology about masks, quick masks, and layer masks, for a retouch newbie?
TIA

The good news is that masking has been the same for many versions of Photoshop (before and after PS7), so you don't need to seek version specific tutorials on these topics.

Here are some tutorials that helped me connect the dots on masking, Quick Mask, layer masks, etc.:

Registration required on this 1st one, but it's very good and worth it. They don't send any annoying e-mails:
#1, part 1: http://www.shootsmarter.com/infocenter/sa005.html
#1, part 2: http://www.shootsmarter.com/infocenter/sa006.html

#2: http://www.webreference.com/graphics/column23/

#3, #4 are probably the most in depth:
* #3: http://www.vrya.net/ts/photoshop7.php
* #4: http://www.vrya.net/ts/photoshop1.php

#5: http://retouchpro.com/tutorials/?m=show&id=166

Hope these help turn on as many lightbulbs for you as they did me.

~Danny~