Diet Coda lets Web developers leave their notebooks at home. The $19.99 code editor for the iPad from Panic, Inc., is portable friendly, including an adaptive keyboard that tunes itself to programming languages for making it fast and easy to work with remote files.
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I've been showing Diet Coda in landscape viewing mode up until this point. However, it also works in portrait mode if you need to work with a remote file while standing up. You can see in this screenshot that it also supports iOS 5's split keyboard for quick standup editing.