Present & Correct has the largest, most delightful collection of paper goods to write on, read, note and give. I could easily convince myself that I need one of everything they sell because everything is simply charming. I just get way too excited about paper.
For the most naughty, funny and plain ridiculous paper goods, Knock Knock has the ultimate collection. Their website includes everything to turn a boring day at the office to a light-hearted bundle of laughs.
Bloomin Flower Cards are my most recent favorite discovery. If you plant the paper after use, it will bloom into beautiful flowers.
Packlab, a branding department at the Lahti Institute of Design, has the coolest design for a paper popcorn bag.