SlixUI is a set which focuses on Mobile Application Designs. You can use these components for iPhone, iPad, Android etc. Of course, nothing stops you from using it for you web applications too.
This Set is extremely easy to use. You can alter the *.PSD file as much as you like because it consists only of Vector-Shape Layers. Which means you can scale it up or down without any quality loss.
You can also reasize the whole thing for iPhone4, Android etc. Here is how you do that:
1. Open the *.PSD file 2. Go to Image -> Image Size. 3. Change the Resolution to whatever you need it. Here are some general resolutions you might need to use:
iPhone4 Retina: 326ppi iPhone3: 165ppi iPad: 132ppi