I use the apple wireless keyboard and the Origami case for it.
Are you referring to the 'regular' wireless Apple keyboard? I ask this because, just tonight, I visited Walmart to see what they had in wireless/Bluetooth keyboards. They were very limited in what they had, and the only one that really shined was the Apple keyboard, for $69.99. I was ready to purchase, but the employee who assisted me (though very nice) didn't know if it would actually work with the IPad. Of course, I could have bought it and returned the device if, in fact, it did not work for me, without any issue. But I thought it best to wait until I found out for sure.
I don't care to get into the all-in-one offerings (portfolio case with integrated keyboard), because I already have a nice Yoobao portfolio case that I love. All i need, now, is just a wireless keyboard to pair with my IPad1.
Apple Wireless Keyboard - Apple Store (U.S.)