A couple of background images, a linked Google font, a touch of CSS3 transformations et voila, you get your CSS post it note! For this demo I've used the Dancing Script font, also included in the downloadable ZIP file. You can reference this font either using a link element or a CSS @import rule when your page is online. Also, a little bit of CSS positioning is required in this demo but nothing you can't understand after just viewing the code.
Here are the files:
Excellent resource and looks great!