by SPIS Ltd TurboNote: sticky note post it style PIM software with instant messaging, alarms and quick launch features to boost business productivity; simple to install, easy to use, highly popular downloadable Windows freeware; extra features with shareware
by Desktop BITs dtNotes puts scraps of virtual paper on your desktop with the simplicity of pen and paper. Though unbelievably easy-to-use, dtNotes is a powerful and feature-rich notes organizer.
by chissoft.com This small program allows you easily attach post-it like notes to your windows desktop. You can use individual visual appearance for each note.
Not overloaded with huge number of features it have nice interface and consume minimal system resources.