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The iPhone application is really nice too, with synchronization and easy-to-use interface. With the latest version (on OS 3.0), it also allows Push notifications, for better auto-sync and notifications.
I have found this an easy to use tool for tracking tasks, and one that has been improving over time. The Firefox integration is very handy, and they've recently added Outlook integration. Go and take a look at the feature list--you'll be impressed.
