if money is not a object the General Dynamics GoBook MR-1 fully-rugged, ultra-mobile notebook. Rugged Ultra Mobile Notebook PC - The General Dynamics Itronix GoBook MR-1 MIL810F UMPC with DynaVue is the best ADV laptop GPS system.

Toughbooks are about the most durable you can get but then you pay the price for them. It's not quite round the world but I will be taking my Linux based Acer Aspire One to Morocco next month. Small lightweight. Cheap. Solid state drives. Take a decent memory card and flash dirve. I just put them through the washing machine and they have come out unscathed with all data still intact :)

Mac iBook
 

A Mac iBook. IMHO Windows based computers suck hind tit.

Apple rocks.