I've been playing around with the Vitalist service. It offers an on-line todo set of pages.
My first impressions were poorer. I wasn't impressed with the garish colours and without really studying it sort of dismissed it out of hand.
However, taking another look at it, they offer:
- Mail / SMS you your reminders
- Integrate with Google calendar / RSS readers
- Simple UI
- i.e. basics for GTD
The only fly in the ointment for me? I can't get the todo list onto my copy of Outlook.
Perhaps it's time to leave the notion of sync everything behind and start down the 3G route with on-line access to my data / integration with SMS etc...
However worth a look if you are into stuff like this.