First of all, while you can't use data and voice at the same time, if someone calls you while you are using data, the call still goes through.
Secondly, the iPhone does not multi-task. Some processes continue in the background (iPod, Safari) as others have mentioned, but that isn't multi-tasking. There is a difference between a
task and a
process - if you don't understand the difference, don't bother commenting on it until you have educated yourself.
The multi-tasking on the Pre works extremely well, you should try it.
Thirdly, why do you think it is that anyone who has actually utilized the card system for multi-tasking has mentioned how nice it is? No one cares about how unnecessary you (hypothetically) think having 5+ apps open at all times is; that isn't even what multi-tasking is about.
Finally, I'll just refer to one of my previous posts
explaining multi-tasking. This topic has already been discussed to death several times over -
don't resurrect that thread. With or without explanation, however, the bottom line is the card system for multi-tasking is just excellent in use. I don't care how great the iPhone is right now, with the card and notification system of the Pre, it would only be better.
P.S.
Yes if it's using memory then it's using battery power. The poster you quoted is blissfully ignorant.
LOL @ calling kdarling "blissfully ignorant".