Acer has made something very clear here at CES -- it's going to enter the tablet market much like it entered the netbook one, with lots of options. In addition to the Android tablets (it's got 4.8-, 7-, and 10-inch versions) and the dual-screen Iconia, the company will be bringing its 10.1-inch Windows 7 tablet to the US market for about $550 in the coming months. Just as we had heard, the tablet will use