EssentialPIM Portable

This absolutely free personal information manager can store, manage and encrypt data: day/week/month/year schedules, to do lists for keeping all your tasks up-to-date, notes (pictures, tables, any formatted text), email messages and contacts. Offers Rijndael 128-bit encryption, MS Outlook import/export, Windows Address Book import/export, search capabilities, versatile print features, and adjustable contacts storage with unlimited fields.
EssentialPIM Portable (both Free and Pro) is U3-compliant and works straight from your removable media, whether you use a USB flash drive, compact flash card, or even a good old floppy.