Notebookreview checked out Asus' M5n laptop. Here's a short quote from their review:

This review will likely help you if you've already decided upon an ultra-portable type laptop or "sub-notebook". Also, if you're seeking information about the new ASUS Z33a, this is the place to find it. The M5N and Z33a, differ only slightly, and are in fact the same laptops with one having a newer generation processor.



Link: Notebookreview