I love this Sticky Notes Software: Notezilla

NoteZilla is an elegant
Sticky Notes Software for Windows. Just as we use paper
sticky notes (eg.
3M Post-It® Notes), NoteZilla lets you create virtual sticky notes
on your Windows Desktop and organize them in to folders. View Screenshots
.

The most attractive capability of NoteZilla is that it lets you stick notes to
websites, documents, programs or any window.