iPad Swipes
Usage example
Well, since I don't have to many ideas to swipe at the moment, for the best example I would like to direct you to my projects page. If you are viewing this page on a desktop, you will see red arrows in the header which will allow you to go from this project to the next and previous ones. If you are viewing it on a touchscreen device you will get a notification.
Implementation
Here, I'm using Matt Bryson's TouchSwipe - you can get the exact file by clicking here. And of course you need to initialize it somehow. I went ahead and created initialization on the body, and added two functions - swipe left with two fingers and swipe right with two fingers. Note also that I used 0 threshhold, which you can get away when using two fingers, but may want to increase it for a single finger, otherwise each time someone touches it they will activate these functions. Also note that you need jQuery for this example - it's usually a given with my code... :)
Icon Usage
I personally think it's very important to show these notifications with icons, otherwise people will never know that this is an option, but I suppose it differs one project to another. Common icons used would include: one finger swipes and two fingers swipes left and right.
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

Code
$("body").swipe({ //swipe left swipeLeft:function(event, direction, distance, duration, fingerCount) { if(fingerCount == 2){ $('#swipeCoverRight').animate({ right: '0' }, 1000, function() { location.href = $('#swipeCoverRight').attr('title'); }); } }, //swipe right swipeRight:function(event, direction, distance, duration, fingerCount) { if(fingerCount == 2){ $('#swipeCoverLeft').animate({ left: '0' }, 1000, function() { location.href = $('#swipeCoverLeft').attr('title'); }); } }, //options threshold:0, excludedElements:$.fn.swipe.defaults.excludedElements, fingers:'all' });