But I have been tempted by a Blackberry and Windows Mobile addon called "Redfly"
http://www.pocketpcfaq.com/reviews/redfly/index.htm and/or
http://www.celiocorp.com/
In theory I could hook up my Blackberry Curve to this. The main thing it has over my Sylvania Netbook is 3G connectivity. My nb has the 7" screen and bigger keyboard that the Redfly has.
Most interesting search term: "blackberry as laptop"