The lack of multitasking in the iPhone is an asset, not a shortcoming.
No, I assure you, it's a shortcoming. Palm's WebOS did multi-tasking the right way (hell, even the iPhone's browser manages tabs in that way). And when I get a call on my Pre, I've never had an issue with "having too many apps open to take a phone call" as you imply. And when I recieve a phone call, it takes up half my screen to inform me of it. You say you rolled Pre's out to your user base recently and they didn't like them, but you fail to tell us who your user base is, and as such, give us no way of knowing if the iPhone, a Blackberry, or anything else for that matter would've fared much better.
I'll say this, after owning a Pre for about 2 months now, and having nearly all of my friends own iPhones, both definitely have their benefits and issues. There are things the Pre has which my friends wish their iPhones had (updates over the air, no need to use iTunes to sync, proper multi-tasking, etc). And conversely, there are things the iPhone has which I wish the Pre had (a more developed app store, better graphics acceleration, better functionality in landscape mode, etc).
I can't honestly say that one is necessarily better than the other, and they can't either from the many conversations we've had on the issue. the big questions is what happens from here, though. Palm's already moving onto their second WebOS powered handset, while Apple's still plotting their next move. I know many of my friends are planning to switch to Android once their contracts are up unless Apple actually does something of substance with the iPhone again. But the bigger point is that thus far they have ONLY the iPhone and nothing more. There're no options. I, for example, didn't want one because it lacked a physical keyboard, and I didn't want to use AT&T. Android, by contrast, is taking the buckshot approach wherein they're basically tossing a multitude of different handsets by different manufacturers onto different carriers, many of which look vastly different in their GUIs, but all of which will share the same core app store and capabilities.
The iPhone recently tried a new marketing campaign wherein they claimed "There's an app for that." By the looks of it, Android is essentially running with "There's a phone for that."
The major difference between bonds and bond traders is that the bonds will eventually mature.