Much like a regular dock, it'll charge your iPad. You'll also be able to use it to sync to your computer, and offers an audio jack to connect your iPad to a proper stereo. It also includes a 30-pin connector, so you'll be able to connect iPad accessories, too. But the most important feature is the integrated full-size keyboard, which bears a striking similarity to the Apple Keyboard, bundled with iMac purchases.
iPad Keyboard Dock
The Keyboard Dock is a dock for charging your iPad, integrated with a full-size keyboard. The dock has a rear 30-pin connector, which lets you connect to an electrical outlet using a USB Power Adapter, sync to your computer, and use accessories like the Camera Connection Kit. And an audio jack lets you connect to a stereo or powered speakers.