Here’s a screencast demo of the best iPad jailbreak app I’ve seen yet. It’s called Quasar and it allows proper multitasking, with apps running in separate windows and continuing to run when focus is shifted to another app.

It’s easy to move apps around the iPad screen, rotate their orientation, resize them so they take up less or more space, and switch them in and out of full-screen mode. I’ve run a half dozen apps at a time, including Hulu Plus running movie trailers, a football manager game, Flipboard, Twitter, Mail, Reeder and more – and seen no noticeable slowdown in their performance and also no big effect on battery life.

As the demo shows, this app really lets us see what the new iPad 3 is truly capable of. Check out the video when you have a chance.