There are a lot of sticky notes tools, hott notes is one of them it is free, light weight and do many functions in a simple yellow post it note style.
Hott Notes is a free sticky notes tool for your desktop and usb drive. It allows sticky notes, check lists, alarms and even you can draw on these stickies. It supports hot-keys to quickly create a new note bring all notes to the front.
You can customize the notes with colors, set transparency settings. You can attach an alarm to your notes to get reminder. With the portable edition of hoot notes you can take hott notes to any desktop you work.
Hott notes is a free software for windows, it works with windows 2000/XP/Vista