While the world has been focused on the launch of Intel's desktop Core 2 Duo, codenamed Conroe, Intel has been readying its mobile counterpart also called Core 2 Duo. With only a few changes to its desktop counterpart -- mainly its lower clock speeds and FSB frequency and thus lower power -- there's no reason to call the mobile version anything but Core 2 Duo.
There hasn't been much interest in Core 2 Duo on the mobile side for two major reasons; for starters, unlike on the desktop, Intel already had a very competent mobile CPU - the Yonah based Core Duo processor. Seeing as how Core Duo is the predecessor to Core 2 Duo, you can already expect that Intel's current mobile performance is quite good.
Source:Mobile CPU Wars: Core 2 Duo vs. Core Duo