Both the 10.2-inch Lenovo IdeaPad S10 as well as the 8.9-inch Lenovo IdeaPad S9 have been spotted at Fall 2008 Intel Developer Forum.
UMPC Portal posted a gallery of photos, while Joanna Stern made a few videos showing off the front-facing speakers as well as the display (and boot-up).
She came away with a very favorable impression of the keyboard and scrolling touchpad: