I came across an interesting post today: 9 Ways the iPad Will Change Time Management. I think it makes some good points. The iPad's larger screen and better calender application will make a huge difference over the iPhone in personal productivity. Also, the ability to carry documents will help quite a bit. Adding an external keyboard will probably make the iPad a serious productivity machine.
If my income were more disposable at the moment, I might consider getting an iPad. But, we're running in "fiscal discipline mode" right now. That means the only way an iPad is in my future is if somebody buys it for me. I'm content with my iPhone 3G though.
Are you getting an iPad?