The reviews and benchmarks on the new Intel 32nm flagship chips are here. The usual suspects have put Arrandale—Core i5 Mobile and Core i3 Mobile for notebooks—and Clarkdale—Core i5 661 for desktops—under the microscope.
How fast are they? Really fast, obviously, and apparently totally worth the upgrade. Clarkdale is fastest that anything dual core out there, while both mobile chips are faster than their Core 2 Duo counterparts, with the extra performance having no impact on the battery life. Like always, don't expect to play Crysis at full with the built-in GPU on any of these, but they will be fast enough for mere mortals. [Anandtech on Arrandale and Anandtech on Clarkdale, Hot hardware on ArrandaleHot Hardware on Clarkdale]