List of web applications that provide at least partial offline functionality to end-user using Google Gears.
Listed in the order of perceived decreasing complexity of offline implementation:
  1. Zoho Writer and Zoho Mail
    • Word Processor, Email
    • Not transparent.
    • You can access documents stored inside your Zoho account and edit them offline inside the web browser.
    • You can read and compose mail when offline
  2. Gmail :
    • Transparent and automatically detects your are offline.
    • Even has a “flaky connection” mode.
    • Full read-write access to your mail.
    • Even allows access to most gadgets
  3. Wordpress
    • Hosted Blogging Service
    • Transparent and full-access to your posts and pages.
  4. Google Docs
    • Word Processor, Spreadsheets, PDF documents and Presentations
    • Transparent and automatic offline access
    • Read-write access to word processor (no new docs)  and read-only access to spreadsheets and presentations
  5. Remember The Milk
    • Todo List Manager
    • Full read-write access to your tasks. Even allows local search engines to search offline tasks.
  6. Some Things
    • Todo List Manager
    • Full read-write access to your tasks
  7. Autodesk Labs Project Draw
    • create diagrams online
    • the application can run in the offline mode and synch files later when you reconnect
  8. MindMeinster
    • Mind Mapping Tool
    • Need pro account for offline access.
    • Full read-write access
  9. Passpack
    • Password Manager for your online stuff
    • Transparent and full-access to your passwords in offline mode
  10. Paymo
    • time tracker
    • Google Gears added the “ability to work offline and sync the data with the Paymo server once an internet connection is available”
  11. Google Reader
    • Feed Reader
    • Not transparent. You have to tell it in advance that you are going to be offline.
    • Can read and update feeds but not add new feeds
  12. Google Calendar:
    • Transparent but read-only access to your events.
List of sites that use Google Gears but do not provide significant end-user level offline functionality on desktop: