On the market for an iPhone? Here's a breakdown of all the currently shipping iPhones from Apple.
New PowerBook Benchmarks
The site provides a small chart running various benchmarks including SpeedMark, Cinema4D, iMovie HD Render, iTunes encode, Photoshop, Unreal Tournament and Compress MPEG2 encode.
Overall speeds are only slightly (as expected) better on the 1.67GHz vs the 1.5GHz machines with the exception of the Compressor MPEG2 encode which was fastest on a 1.5GHz model for unclear reasons.