After reading people on this forum talk about moleskine notebooks I switched to one from filofax and a cracking bit of kit it is.
When people praise their PDA I suggest we compare them. First test: I slam my moleskine on the desk as hard as I can "ok now your PDAs turn..." :-)
I got the London guide which comes with what it's website calls 'the latest high-tech global positioning system' clear plastic sheets to stick on the map pages and draw your route on :-)
Does anyone know of a waterproof notebook that is as sturdy?
The Sock

Go to the source: http://www.riteintherain.com/ItemForm.aspx?item=390-4F&Category=

for waterproof notebooks that is, not Moleskines. A little bigger and soft covered not hard covered, but they seem to be as close to a Moleskine as you're going to find waterproof wise.