The study that came up with these findings was commissioned by a company that makes widescreen monitors so that's a bit weird. But I have a widescreen and I am significantly more productive using it than I was in the past with my tiny 15 inch standard format display.
The point of the post is whether or not the iPhone is ready for enterprise use. Enterprise users are mostly BlackBerry users. Who else would you ask if they'd make the switch or not?
Yeah, Notes sucks. I use it at work, and it is often painful, especially if you use another mail client that's user friendly. Then you know what you're missing.