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The iPad has a bigger screen, and so it has a bigger resolution. With the iPhone 4, however, Apple did something different: they increased the resolution without changing the physical size of the screen. This makes for a higher pixel density, pixels are smaller and more tightly packed. In one square inch of the iPhone 4’s screen there are around 106 thousand pixels (at 326 PPI, or Pixels per Inch), while the older models have only about 26 thousand (at 163 PPI) in an inch – 4 times less! This makes graphics on the screen seem like continuous lines, because your eye can’t see the individual pixels. Apple calls this technology the “Retina Display” because they claim the human eye (the retina) can’t physically see the pixels at this resolution.

Using Two Images The official way of adding high-resolution support to your application is by having two versions of each image, one in “regular” resolution and one in double resolution. Whenever your application is viewed on the Retina Display, the larger image will be loaded automatically. This method allows for full and precise control of how your application will look in each case, and is very easy to apply to your existing applications. The full size image file should be named however you want, such as “Button.png”. Use this image name in your code and Interface Builder wherever you want to reference the image. The double-size image should be twice the size of its matching smaller image and named exactly the same with “@2x” appended to the name. In our example, we would name it “Button@2x.png”. Unfortunately, this technique will not work on the iPad; a pixel-doubled application will not load the higher resolution resource. This will probably be addressed in the future iOS 4 update which is scheduled to come to iPad this fall.

Screen sizes and densities of emulator skins included in the Android SDK.

Larva Labs presents a home screen that creates a meaningful hierarchy out of your information. Built for Android-based handsets, our home screen is designed for heavy phone users and people struggling with information overload.

ZoomIt is screen zoom and annotation tool for technical presentations that include application demonstrations. ZoomIt runs unobtrusively in the tray and activates with customizable hotkeys to zoom in on an area of the screen, move around while zoomed, and draw on the zoomed image. I wrote ZoomIt to fit my specific needs and use it in all my presentations.ZoomIt works on all versions of Windows and you can use pen input for ZoomIt drawing on tablet PCs

Slideshows made with FullScreenPhotos.com fill the screen on desktops, laptops and even mobile devices, letting your viewers instantly focus on what counts. It's the sharp, smooth, and easy way to show off your real estate, product listings, photography or anything you want.

Adobe claims that we are a closed system, and that Flash is open, but in fact the opposite is true.

Flash is a closed system.

Symantec recently highlighted Flash for having one of the worst security records in 2009

designing for a mobile device can lead to a solution that is worlds different than its desktop equivalent.

Context of Use

Users have a very specific need and desire to accomplish their goal in the easiest and fastest way possible. This fact alone helps explain why mobile interfaces are designed the way they are

Press the Home and Sleep Buttons Simultaneously to Take a Screenshot

Enable International Keyboards for International TLDs

Hold Home and Sleep to Reboot

App Store Icon 512x512 (scaled down to 175x175 for display in the store)

Application Icon 114x114 (iPhone 4) 57x57 (older iPhones) 72x72 (iPad)

Spotlight Search Results and Settings Icon 58x58 (iPhone 4) 50x50 (Spotlight results for iPad) 29x29 (settings for iPad and older iPhones)

Here's what they learned, based on users' feedback, preferences and complaints: Touchable areas are often too small, too close, not easy enough to discern.

iPad users dislike typing on the touchpad.

The Web browser has its limits.

It’s the world’s first gesture-based screen reader, and it allows you to enjoy the fun and simplicity of iPad even if you can’t see the screen.