EssentialPIM Portable is a free personal information manager that makes it easy to control your appointments, to do lists, notes, email messages, password entries and contacts. It is a freeware information management application that's efficient, portable and easy-to-use.
Here are some screenshots to illustrate the features and user interface of this application:
CherryTree for Windows
Simple Sticky Notes
Efficient Lady's Organizer Free
EssentialPIM
EverNote