I got this idea from a blog posting over at Mac OS X hints.
If you really want the iPod Touch and the only reason you are sitting on the fence is because of the limitations Apple placed on the device (no way to add to the calendar). Then go no further. Try this out. Make a contact names @add to calendar. In this contact just add a note field and place all the stuff you need in there starting each line with a bullet of some king like a “-_. This can be done for lists as well. I went to a local Best Buy and tried this out and it does work.
If you are missing the todo list on the iPhone this could work there as well.
Let me know what you think.