Skype released their iPad app just last week and their previous update for Mac came just a month ago that brought group video screen sharing and multitasking functionality. Now, they've just released version 5.3 for Mac that will be adding HD video calling as well as support for new Lion features.
Now that the 2011 iMac and MacBook Pro's come with a FaceTime HD camera, it makes sense that Skype should take advantage of this and offer the option for HD video calling. The new feature also works with a variety of add-on high-resolution webcams. But to receive clear HD video calls its recommended to have a connection speed of at least 1.5Mbps.
The update also adds full support for Mac OS X Lion while promising backwards compatibility with Mac OS X Snow Leopard. Other improvements include new contact sorting, searching, and viewing options.