With duel specs coming out shortly. There will be a rush for glyphs and herbs again. It will not be as big as the first one, but it will still have a decent amount of sales.
Because of this I have compiled a list of Glyphs that I have found to be the biggest sellers based on specs and PVP purposes. I have came across these by asking those who play the class and reading forums for the classes.
I made each profession into a page since some of them are long. I will be adding daily (or maybe twice a day as I get done adding links etc)
Also feel free to add what you think is missing as a glyph.
Death Knight Glyphs
Druid Glyphs
Hunter Glyphs
Mage Glyphs
Paladin Glyphs
Priest Glyphs
Rogue Glyphs
Shaman Glyphs
Warlock Glyphs
Warrior Glyphs