"The three most common areas of interest with regard to build/aesthetics are keyboard, screen, and battery seating. I've noticed that the non-TRADITIONAL 'p' (as I defined above) and standard T42 models use different keyboards (at least from the one's I've used/reviewed). Both the T42 (2373CYU) and T42p (2379DYU) have keyboards with slightly stiffer/muffled keys. What I mean by this, is that the keys on my T42p (2373GRU) make a slightly more clacking noise and don't seem as firm as the keyboard on the T42 (2373CYU). In addition, the bezel around the volume keys on the T42 (2373CYU) and T42p (2379DYU) was matte, like the rest of the case, whereas my T42p (2373GRU) has a glossy bezel around the volume buttons, just like previous T41p/T40p models. So... I removed the keyboards to take a look. Interestingly, the T42p (2373GRU) seems to have more than double the 'air holes' on the underside, allowing the keys, I assume, to be more 'jiggly' due to less air resistance (?). The keyboard from the T42 (2373CYU) and T42p (2379DYU) had fewer "air holes" on the underside, and the keys felt firmer, with more bounce back. The model numbers are also different, despite what the Hardware Maintenance Manual suggests. The T42 (2373CYU) and T42p (2379DYU) came with keyboard 08K5044 Model RM87 built in Thailand, while my T42p (2373GRU) has keyboard 08K4986 Model RMUS built in China. Not sure why the difference, but the keyboards are quite different from a tactile standpoint, and I much prefer the 08K5044 keyboard built in Thailand. Maybe Mofongo can check his keyboard part and model number too. And finally, with regard to the keyboard, the 15" models seem to have very firm, non-flexing keyboards, while my T42p still has the slight flexing on the right side (business card cured). "