After an internet search, I bought ToDO from Guided Wave Technologies for my iphone. It told me to sync with Toodledo. When i did that I found the Toodledo version for my iphone. Is there any benefit in having the ToDo app in that case?
I keep both apps on my iphone next to each other. I have toodledo always sorted by GTD values ("next action", "active", etc) and todo sorted by date/time... That way I can hit an iphone icon and see either (toodledo) what is important or (todo) today and tomorrow's schedule.
I'm sure there are better ways, but works for me--they are both good apps, although if I could keep only one, it would be toodledo, but I use both every day.