Nexus Galaxy 7inch 32gB Wifi tablet
+ Sygic, CoPilot, Navigon or equivalent for turn by turn (street) navigation (I use Sygic),
+ OziExplorer for off-road (topo map) navigation,
+ all of the functionally you get with a tablet with a fantastic 7inch screen and saving the weight, hassle and expense of carrying a netbook as well ,
and all for A$400
Which is exactly the setup I now have :)
The disadvantage is that you can't mount it on a motorbike (not weather proof and possibly not rugged enough to survive big falls) - I keep it in the map pocket of my tank bag (I do windscreen mount in the car) noting that I don't constantly refer to it, I just need to be able to have a look very 15mins or so to see how I am travelling. I use the non-3G (non cellular phone) version and tether it to my mobile phone which gives me internet access.
bikeless no longer! welcome home, 2011 KTM 990 Adventure!