Westmere can be summarized as Intelís effort to bring Nehalem performance to the mainstream consumer. Clarkdale represents the first time that Intel has debuted a new process technology (32nm) on a mainstream product (previous launches were introduced at the high end levels and then trickled down to mainstream products). This progression follows right along in Intel's Tick-Tock Development Model shown above. In this manufacturing model, "Tock" is the introduction of a new microarchitecture while "Tick" can be described as moving that existing process architecture to a smaller processor core size. Westmere falls into the "Tick" category in this model.
Another big step for Intel with Clarkdale is including a graphics core, dubbed Intel HD Graphics, directly on the processor alongside the CPU die. In the scale image above, the left core is the GPU and the right core is the CPU. There are a few things that stand out with this design that I want to point out.
First, while the CPU core has dropped down to 32nm, the graphics core remains at the older 45nm size. Also note that Intel has put the PCIe and Memory Controller on the graphics core and not the CPU core. One must wonder if such a move will have any adverse affects on the package's overall memory performance.