e-detail isn't a Tablet PC manufacturer I'm familiar with, but their latest slate-style machines - the 12.1-inch Prezenter PSR and the 14.1-inch Multi-Web PAD - are likely to get some attention thanks to each having not one but two touchscreens. Intended for presentations, where the audience would watch the full-sized screen, each device also has a seven-inch mini touchscreen so that the presenter can keep track of his topic.
Both main displays are 1280 x 800 with LED backlights, and they share the same 800 x 480 sub-display. Processing is courtesy of the AMD Geode LX800 processor and CS5536 chipset, they have an 80GB hard-drive, built-in 1.3-megapixel webcam and stereo speakers, kick-stand and wireless. e-detail promise around 3.5hrs battery life with wireless switched on.
GottaBeMobile have a video of the e-detail slates in action.