update (July 2010): ThreeTags iPhone App is no longer available on iTunes.
ThreeTags Secure Notebook is an iPhone app that synchronizes with ThreeTags Online Notebook. It uses the same security architecture as our online service – all data is stored on our server encrypted, and your password/encryption key is never available to ThreeTags staff.
Key Features:
- Hierarchical tagging system (all versions)
- Strong AES-256 encryption
- Secure (encrypted) online synchronization
- GTD support through contexts (tags), due dates, and priorities
- Rich text (html) support: fonts, colors, bullets, etc.
- Web link (bookmark) support
- Portrait, landscape, and full screen viewing modes
- Filtering: limit the main list by tags, due date, and/or priority
- Scalability: works with thousands of notes, each note can be up to 250k
- Password/passcode protection
Screenshots:


