If you're the person who works at a desk with hundreds of hot pink and yellow Post-It notes pasted all around your computer, then it might be time for you to upgrade to Postica. It's a new application that creates virtual sticky notes that can be shared with friends.
Postica provides a blank space where notes can be dragged around and saves their location so that it looks the same on any computer. It's fairly simple to attach a file, change the color of a note, and e-mail it to another user.
Postica, like the wiki-style app Protonotes, might be useful for those of you who enjoy using Post-Its 2.0 and have been wanting to share your desktop notes with your friends. It might even save time for setting aside files instead of e-mailing them to yourself.
But if you already use the hundreds of "reminder" and "file-sharing" apps, software, and sites that exist, Postica probably won't phase you in the least.