Hurrah!  But to be honest I've never been that fussed about multi-tasking on such a small device (would you really want 3 windows open at the same time on your dinky iPhone/Touch screen?) .  And given all applications save their current state when you exit out of them it makes task-switching almost as effective as multi-tasking.  On iPad, however, this would be nice.  Hope it's true as I pre-ordered my iPad yesterday!