To date, in consumer-grade devices, Android can come in any screen size you want, so long as it is HVGA (320x480). That, my friends, is going to change, and soon:
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Archos has indicated they will have Android-enabled media tablets; their current devices have 800x480 screens
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There has been enough discussion about Android netbooks that someone, somewhere, is likely going to come out with one that enjoys wide distribution
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One can easily imagine somebody developing a QVGA (240x320) non-touch-screen device in more of a “feature phone” form factor, such as a flip phone, in a drive to create an inexpensive Android device
It is important for developers to start seriously thinking about what their apps will look like on different screen sizes, and not assume everything runs 320x480. Developers should already have a taste of this through building portrait and landscape renditions of their UI &,dash; multiple screen resolutions simply extends this existing pattern.