DropNotes is a note-passing system for informal sharing of information within a small group or for posting notes to oneself. Its goal is to improve collaboration by increasing awareness through peripheral displays. DropNotes typically appear on peripheral displays placed in the work environment, such as a door panel, a peripheral display near the phone, a group board in a break room or a PDA. The design of DropNotes focuses both on making note creation easy and on minimizing interruptions. As such, DropNotes supports informal information sharing and peripheral awareness rather than messaging. Keywords Peripheral display, awareness, messaging.