#1. Thank You Cards. Love Vs. Design has some great templates for weddings, this template comes up a winner for these sweet thank you cards.
#2. Save The Date Cards. The Wedding Chicks are my go-to for awesome free templates as well as great items in their retail shop. I adore the simplicity of these std's, especially the full tutorial for those DIY-hesitant like myself.
#3. Wedding Invitations. Download & Print has some fab options for free templates, such as this one I love.