iPad Wireless Keyboard

Use the Apple Wireless Keyboard on your desk, on your lap, or anywhere within 30 feet of your iPad. Its compact design takes less space on your desktop than full-size keyboards. And it features a low-profile anodized aluminum enclosure with crisp, responsive keys.*

The Apple Wireless Keyboard requires just two AA batteries. And its intelligent power management system conserves battery life. So when you’re not using the keyboard, it automatically powers down. The instant you start typing, it turns back on. Use the on/off switch when you're away from your iPad for a long time.
From what I hear, the iPad keyboard is good, but not great. I don't know if I'll ever be using the iPad for any serious word processing or anything like that, but the Apple Wireless Keyboard is very small and if I thought I might need it I wouldn't hesitate to stick it in my bag to go to class with my iPad.

Of course it doesn't specify if it supports any other bluetooth accessories, but it also doesn't specify that it doesn't.

*Some function keys designed for use on the Mac will not work on iPad.

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