If you hold down the Command or Shift key while in the Applications tab for your iPhone/iPod touch in iTunes 9, you can choose multiple applications at the same time, then slide them over to a new screen on the iPhone/Touch. Finally an easier way to move multiple apps!
Minor GUI nitpick: the Shift key should allow a whole row or selection to be chosen in a contiguous manner, while the Command key should allow for non-contiguous selections. This would make the behavior consistent with the Finder.
[robg adds: Don't overlook the ability to drag entire pages, too, as noted in the short note on that screen. If folders get added in OS3.2/iTunes 9.1, app management will (finally) be basically perfect for my needs.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20090910001514193