Just wanted to post this since I came across it the other day. Woot.com was offering an iGo green laptop adapter with multiple heads for different laptops. I mainly got one for my main machine (So I could have 1 adapter here at the office and 1 at home) but on a whim, since it's also 19V, I flipped through the heads and noticed that the one labeled 706 works great with the Smartbook.The blog post that talks about it from woot.com is located http://www.woot.com/Blog/ViewEntry.aspx?Id=21814
So if you're after another charger, (and this one also has a usb charging port as well as surge protection... I'd personally (not professionally!) recommend this one.
Steev Klimaszewski, Genesi USA Inc.
Senior Software Engineer