Just for information in case you havent heard of it, N900 is technically capable of doing multitouch, so do many other smartphones. It is not that difficult to achieve.
The fact that only iPhone has multitouch is not due to its technical superiority,
it is simple because of the fact that Apple is holding the corresponding patent, and Apple is unwilling to license anyone else to use multitouch. So anyone who is blaming its phone not having multitouch while it should be, blame Apple.