I attribute an easy labor partly to Mountain Rose Herbs Red Raspberry Leaf tea.
Celestial Seasonings Candy Cane lane is a special treat! I drank Celestial Seasonings Tension Tamer through pregnancy, too, while at work because all its ingredients seemed "safe".
I drink Tazo Zen (green tea + spearamint) most often because it's stocked free at work
I've got Trader Joe's Peppermint tea brewing right now.
I'm not into black teas, really. My absolute favorite are the teeny tiny samples at Teavana- they're heavenly! I never buy anything there, because I'm sure I wouldn't be able to work their magic and brew the tea just right.