Sanwa released yesterday an HDMI adapter compatible with iPhone 4 and iPad. It allows you to display videos from your device on your TV with a 720p quality, as well as pictures, presentations via Keynote, and any file Goodreader can open. Unfortunately, it doesn’t work with earlier versions of iPhone or with any iPod at the moment. Measuring 53.5Ã?53Ã?13mm it sells for 5980 yens.
HDMI will probably be standard equipment on the iPad 2 and iPhone 5
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Ah, I've been looking for something like this. It's not exactly available here yet, but nice to see that someone's working on it.
According to the website, it will support 720p video from an iPhone 4 and iPad.