We gave it a whirl last weekend and we love the extra screen space. Unfortunately, as others have noted, it requires some retooling of the site pages to prevent page changes from loading in regular windows. For those of you interested in the details: more info here, here and here [ADC Login Req'd]
We'll let you know when it's ready, as you have to add Packagetrackr anew to your home screen, but in the meantime, here are screenshots.
Packagetrackr, as you see it today:
Packagetrackr, as a standalone web app
