Here's another good todo list -- you can enter your todo's either online or on your iPhone. I leave mine set to this on my iPhone as the last visited site on Safari so it is always there when I touch the safari button.
Try using any web app while you have no coverage. Need built in apps. Three times I have tried to use todo lists etc and my signal strength goes away and no edge while shopping in the grocery store.
I am the developer of iPhoneTasks.com.. If there are other features that you all need, please let me know. I am more than happy to add them. Obviously due dates are important, so I will add those asap.
I guess one they want is persistence. they want to be able to view the to do's when no network is available. I'm not sure you can do this with a Safari accessed web 2.0 app. There would have to be a piece that somehow resides on the iPhone.
I imagine this should work if I were able to write all changes to cookies and then sync the changes when a connection is available, and wait if not. I'll give it a shot. I also made some updates to this application that allow easier navigation. I am in the process of adding "edit" and "delete" functionality as well.
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iPhone/iCal To Do List
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