ToodleDo is a todo list application with real power.
The customisability is substantial and I suggest giving it some for thought before adding too many tasks. I will post on some of my methods for using it effectively.
Some features are only available with the paid subscription but see connections below. The iPhone application is very good so my todo list goes with me everywhere, however it is available through any browser and has the ability to place it on iGoogle and other helpful places. Your todo lists are retained on the iPhone off line and you can sync only when you want.
I initially got it to synchronise with my own TiddlyWiki (Details in future posts) however I mostly use it in it’s own right.
From the ToodleDo site: Toodledo has the ability to connect to many popular services and devices to allow you to access your tasks from anywhere. You can also import and export your data in a variety of formats. It’s your to-do list, so you should be able to take it with you. You can manage all of your import, export and synchronization services from this page.