I was pleasantly surprised when I discovered that my old Stowaway keyboard (which was originally made by iGo) worked on my Apple iPad. The keyboard is really small, it works on 2 AAA batteries, and the keys are very easy to press. Plus, the keyboard folds up and stows away very nicely (hence, the name). Unfortunately, this little Bluetooth keyboard was discontinued a while back. I should have purchased an extra one when it was on clearance!
As my friend pointed out, an external keyboard makes all the difference in the world if you're doing a lot of typing. The iPad is a great travel device and I look forward to using this on the plane later today. Now, I have arrow keys!