What all you can not do with maps.google.com? One thing I noticed is, I can not change the route in the "directions" view which is very useful sometimes.
What I am thinking is, if Apple maps some other gesture to the same events as click-n-drag that the javascript behind these web pages expect, then it should work, shouldn't it?
As far as my.yahoo.com, there is an edit button. If I touch it, it gives an inplace pop up menu to move the module. On a regular computer, clicking on it moves it without taking me to a new page. On the iPhone, I have not managed to do that. I am not even sure if that in-place pop-up menu even allows touch interface but a couple of times, somehow it took me to configuration screen.