Always Innovating has an interesting Smart Book Tablet/NetBook concept.
Last year they started shipping their Touch Book which involves a Tablet that slides into a Blue Tooth Keyboard cradle. You could buy the Tablet alone for $299 or the Tablet with Keyboard for $399.
Now they have a Smart Book bundle which hasn't shipped yet. The CPU is inside a small MID which does VoIP Over WiFi. Then you slide it inside a Tablet to get the bigger screen, and then slide that into the Keyboard cradle. Cost is $369 for the MID/Tablet combo, or $549 for the whole package.
There's also the Smartbook Surfer coming soon from a German company who seems to have TradeMark-ed the "smartbook" name all over the place...