Nehalem for notebooks by the end of 2009

While Intel prepares itself for November's Core i7 launch, the first rumors on a mobile version of the quadcore chip have already appeared. Intel reports that the notebook version, codenamed Clarksfield, won't be taken into production until the second half of 2009

It's still unclear whether this date concerns the production of test versions, or the mass production of the final processor. This makes it impossible to say whether the CPU's will be released in the third or the fourth quarter of next year. Like the desktop version, this mobile Core i7 processor will be produced at 45nm and will feature an integrated DDR3 memory controller and advanced energy management. Whether the triple-channel DDR3 feature will make it to the notebooks isn't known yet.

Nehalem will be available for notebooks by the end of 2009

The new quadcore Clarksfield will be the base of the new Centrino platform, which is labeled on the roadmap as Calpella. This new processor will also require another chipset, the most likely being a mobile version of the still to be introduced P55 chipset.
When the Centrino platform was last updated, Intel introduced two 45nm quadcores for notebooks, so it's likely these will last until the mobile Core i7 is ready to follow them up.

Source: PC World