Ok, so I think I managed to tell EVERYONE that I went on a big long trip to Asia for a month and took loads of pics.
Here's what I learned and what might help you on the road if you do something similar.
1. You can do this. I was a bit concerned that editing and processing on the road was going to prove simply impossible in practise. It certainly wasnt. In fact, I think I'll continue to process in this fashion even when home.
My kit was:
Ipad 2 and camera connection kit.
Lowepro bag (smallest one that would take the iPad)
50Mm lens (though I recommend it)
USB to Mini USB cable
All of the above with the exception of the Netbook fitted into my Lowepro (with a little encouragement) which made it very portable and handy.
The Netbook was my backup solution because I knew my 16gb Ipad wouldnt be able for everything I was going to shoot. In the end it almost was, for reasons I'll explain, but it was handy to simply dump everything onto the netbook as a secondary storage.
Shoot a full days stuff and at night transfer everything to the Netbook. I had the external HDD just in case I exceeded the NB's capacity but I didnt come close. You might if you are shooting huge raws, so consider that.
Then I would transfer almost everything to the iPad (excluding any shots that looked b0rked beyond repair). Then I'd pass through them picking the shots from the inevitable "I'll take 6 of this, just to be sure" repetitions.
On to apps. I downloaded a bunch of app to process pics. I was looking for something quick but powerful and the ability to export to Flickr was a plus.
I tried a variety but I'll save you the hassle. Get Snapseed. Its the best imho. Eventually I stopped using anything else. I did have a soft spot for PhotoToaster because of its preview of filters, but in the end, Snapseed fulfilled exactly what I was looking for.
WARNING: I dont pixel pushing so if you are looking for some that goes to the pixel level and will do things like clone, heal, smudge etc... then you need to look elsewhere. Start with FilterStorm which at least supports layers.
Word of caution, when I was travelling I had intended on doing bulk backups to something like DropBox but the connectivity on my travels (Thailand, Cambodia, Vietnam, China) was pretty poor in terms of broadness of band
It took too long to bulk backup (hours) so I dumped to Netbook as a fall back.
Getting photos OFF the iPad isnt the easiest either without a computer.
The good news is that I found editing with Snapseed on the iPad a dream (once you get used to the slightly quirky interface). I literally prefer editing on it now then on something like Photoshop which now seems very laborious in comparison.