Do you need a todo list that you can share with Gmail, Iphone/Ipod Touch, Twitter and even Windows Mobile?
Than, Remember the milk may do what you’re looking for.
I have to admit I don’t use gmail, smartphone, etc :(
I just read this review but haven’t test it yet … someone can give me an iPhone? :D
ps: if you already use it, please tell me.
pps: similar tools? tell me as well.