The iPad will be launched on 3rd April. Shipping notices have already been sent to many buyers. Many developers and companies are working on making iPad apps and at the launch day 100s of apps of iPad will also be released.
As the video shows the app is similar to the Dashboard in OS X and even allows you to use the widgets developed for it. It seems useful to access quick information at a time. Dashboard will actually allow you to multitask in the app which makes it a useful piece of software.