How much of the time that you spend using iWork applications on your computer do you have a web browser open side by side it because you practically need it? Probably at least half of the time. iWork applications on the iPad would be so much more useful if you could have half the screen taken by an iWork app and the other half by Safari or Mail in either landscape or portrait orientation. This would certainly be practical, especially since we're already used to working with smaller-sized apps, using multi-touch to scroll and zoom around. I know I'll be purchasing Pages on launch day, partly because of how interesting it will be to use on the iPad since it's so feature-rich. I would write reports on the iPad if I could have Safari or maybe Mail open at the same time. Even with the keyboard taking up a decent portion of the screen, there still is more room than two iPhones could display. If you're using an external keyboard, you would probably be more than comfortable with the split side by side apps. Not adding support for any two apps to open up side by side would be fine and practical. If Apple wanted to greatly increase the functionality of the iWork applications, it makes sense to allow iWork apps and core apps to be open side by side since that is what consumers are usually used to when using iWork applications.