When iterations contain too many stories, it is annoying to have to scroll down in a small space, especially, if I want to move something to a different iteration.

It would be ideal to have the iterations shown vertically on the left side of the screen, with the right side showing all the potential stories as is currently shown on the bottom of the existing screen. Old iterations should be automatically 'rolled' up (a single line item showing the iteration name) so that if someone wanted to see the stories in it, they could simply expand it out.

See how Pivotal Tracker does this.