Yellow post it notes are cool and a really good way to get someone's attention, don't you think ? I had in my disposal the transparent png solution for IE using CSS so all I needed was a cool graphic and a way to position it anywhere on a page using just CSS.
The advantages of this implementation are:
- you don't need javascipt
- you can position it anywhere on a page by changing a few css parameters
- any PNG-24 graphic will do, no need to think about what colors will be behind it on the page
You can take a look at the complete css post it note example and come back for the details: