Get The TechniqueI know I am repeating myself - and others - but seriously, the stuff being done with post-its lately is worth a second mention.
A friend of mine just sent me this animated video, done entirely in colored post-it notes.
This wallpaper is made of layers of multi-colored post-its that create an ever-changing pattern as you use & discard the layers. Found via Apartment Therapy. 
I love the TO DO projects by the group illegal art. Made of post-it notes, these installations encourage passersby to write down & share what they've got on their to do list. 
As an alternative to the standard post-it sizes, Muji makes this set of slimmer stacks. They are perfect for tagging book pages and short notes - and don't use nearly as much paper per stick.
From: Meaghan (chic cookies) | 7/4/09 at 10:24 pm
I saw the same stop motion video (Deadline) yesterday and was utterly blown away. I also just found and recommend http://www.eatPES.com. Not post-it related, but "Spaghetti Western" is a must see stop motion. The creators cook a spaghetti meal using inedible objects such as a Rubik's Cube, Pick Up Sticks and pin cushions in lieu of real food. Rivaled Deadline in its brilliance.
From: Cindy Lietz, Polymer Clay Tutor | 7/10/09 at 6:11 pm
I'm in love with the post it wallpaper! I would love some of this for my studio!
From: Valerie @ Frugal Family Fun Blog | 9/11/09 at 11:59 pm
We did a fun family photo shoot with Post-Its! You can see photos here:
http://www.frugalfamilyfunblog.com/2009/08/more-fun-with-post-its.html