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I’m looking to automatically alter styles and other visual elements to better take advantage of screen-space when running on an iPad vs. an iPhone.
How do I identify the device I’m running on (and, ideally, its screen resolution) from a web application?
You can detect the screen resolution using JavaScript. Additionally the platform (iPad / iPhone / iPod) is listed in the user agent (which you can also get via javascript).
Examples of user agent strings:
Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
Note that, in the wild, iDevice users sometimes mod their user agent string to something else (a small fraction of a percent of times in my experience).