One look at the HP TouchSmart tx2 notebook, and you'll want to get your hands on one, literally. Its 12.1" widescreen display swivels into a tablet, and lets you use two fingers to expand and pinch graphics, rotate and move objects around the desktop, drag things around and double tap to open — no mouse required. As you can do with HP's first TouchSmart desktop PCs, you can also attach a stylus pen and paint or sketch. Or you can just write on the 1200 x 800 screen and your handwriting is c