One thing I've been staring at is a group some of you might have heard of.
Tiger Force Recon
Most people have heard about them, without knowing it. If My Lai means anything to you, supposedly these were the guys. They've got a lot of really useful photos, and also a lot of great stories from the war. I've been using this website for most of my research into my Vietnam loadout, along with the stories from my grandfather.
I've especially enjoyed the file on Stan Parker.
I'll also recommend two books : Blood Trails, which is essentially the combat diary of a grunt foot-soldier during his tour, and Letters to Mom. Blood Trails discussion of grenades is probably a highlight. While not heavy on technical details, they do provide insights into SOP and life in 'nam.
The King Of al-Talk. Hey, at least I'm not a troll.
My dog wouldn't know what to do with a duck if she caught it, but she's cute. And hates Mexicans. +1!