GlueyNotes is a new web app made for iPhone that incorporates GTD (Getting things Done). The site also includes a videocast of how to use the webapp.
This seems to be a great way to keep a to do list if you haven't already tried W2 (click here).
Logging in on your iPhone gives you a different view than logging in on your browser on the computer. This uses what looks like markdown and a few pointers from GTD. Also, checking things off on the iPhone, doesn't delete list items completely, it still leaves the item in the list with an x next to it when you go back into the browser.
A better explanation of how to use GlueyNotes is here on Rob Rohan's blog.
Try it out if you need an on the go to do list or would like to use GTD on your iPhone. We'll be taking it out for a spin today.
I like what you are doing and it works pretty well, but how do you stay logged into the page on the iPhone? If I have added a new to-do, there is no way to recycle the view on that web page to get the update.