Dave Miller reviewed the Intel Centrino 'Sonoma' based Z33a laptop from Asus for Notebookreview. Here's a snip:

The Asus Z33a is an ultraportable notebook geared towards people on the move. It is basically a Sonoma chipset refresh of the Asus M5n. It also shares many of the same characteristics as the Asus S5a but the Z33a includes a built-in optical drive. The Z33a is part of Asus' whitebook series of notebooks. The whitebooks are customizable to better suit the end-users needs. The ensemble notebooks, such as the S5a, come pre-configured from Asus although RAM and hard drives can be swapped latter if desired.



Link: Notebookreview