I promised a post on the thickness of thread, and I promise it's in the works.
But in the meantime, I ran across this explanation of thread quality with microscope pictures for your viewing pleasure.
I hope this helps when you're out buying thread? For what it's worth, I never buy Coats and Clark, only Gutermann but recently was cursing a bad spool of Gutermann that kept breaking.
Metrosene is the best I've sewn with, but I can't find it in many local stores?
Hope you guys are working on something fun. I just watched the movie Precious so now I'm sad and traumatized and need to recover! ~