I was so looking forward to a game called Zenonia for the iPhone, but when I saw the screenshots I was a bit shocked.
They murdered the pixels:
And this isn't the only game that has done this. Puzzle Quest does it too (even stretches the graphics) and 24: Special Ops uses a horrible scaler. I'm not sure if Crystal Defenders does it, but it looks suspiciously like bilinear filtering, even though they've added horrible ugly borders, instead of drawing proper widescreen graphics.
In short, for me this means that I'm staying as far away from ports to the iPhone platform as I can.
Though some ports choose a different route.
Both Pinball Dreams and Boulder Dash try to update the original graphics, but thankfully, you can choose to have the original pixels via a menu option.