X-bit Labs has written a review of the Asus U3S laptop, this unit has a 13.3" LCD display and is powered by Intel's Santa Rosa platform.
The letter U in the product name indicates a product from the Superior Mobility series like the recently reviewed U1F. The U3S is more advanced and larger, though. Besides the two graphics cores (you can choose the core to use by means of a slider switch on the right panel), the notebook features Intel’s Santa Rosa platform with a Merom-core Core 2 Duo processor. The notebook may be optionally equipped with a 3G module, a GPS module (it is present in our sample), and an Intel Turbo Memory module. You can’t have all the three modules at once, however, because the mainboard has only two expansion slots, one of which is already occupied by a Wi-Fi adapter. The remaining slot is usually used for a GPS module.
The ASUS U3S resembles the U1F externally except that it provides two extra inches of the display diagonal. This should make it a more comfortable work tool because the U1F’s 11.1” display seems too small for many users. The 13.3” LCD matrix of the U3S is an optimal compromise between comfort and dimensions.
More details over here. The reviewer says the Asus U3S is a well-balanced solution in terms of weight, size and power consumption but complains that the price tag is very high.