"ScrapBook" is an enhanced note-taking application for Palm OS, supporting nested folders, versatile search capabilities, and encryption. 

Key features include:

• Use as many folders as you need, nested as deeply as you need
• Individual notes can be encrypted, using individually chosen passwords
  
• Excellent search capabilities make it easy to find what you're looking for
• A list of keywords can be assigned to each note
• Note titles, keywords, and message text can all be searched
• Even encrypted notes can be searched (provided you supply the passwords during the search)
• Notes can be exchanged with the Palm OS "Memos" program
  
• Organizing notes in "categories" is also supported (to ease the transition from Memos)
• Entire categories can be imported or exported at once