Richie...
My Samsung Galaxy S4 smartphone with folding Bluetooth keyboard, OTG (On-The-Go) cable, 3TB USB hard disk drive, and Anker 20,000mAh battery proved to be an ideal journaling solution and camera for me on my double transcontinental European crossing this summer. I used a single Joos Orange solar panel with integrated 5400mAh accumulator battery to recharge the phone at night, keeping the Anker for heavy usage and to extend my time between mains (re)charging, since AndyBG's bike was not equipped with a dynohub, charging interface, or buffer battery.
Mostly, I used a stylus and the SwiftKey Flow on-screen keyboard for writing and it all came out fine...or well enough to produce 283 single-spaced A4 pages of journal entries.
Now, I have the task of editing and transferring it all into an online daily blog, along with the 9,000 or so digital stills and full-HD videos, also taken exclusively with the phone. Things are delayed a bit as I whack down the tasks that accumulated in my absence; the most pressing has been painting the vacation cabin at the Coast so it will hold up against the coming 175kph storm winds of winter.
When it comes time to replace the phone at the end of my contract, I'm seriously thinking of going up a size to a "phablet" -- phone the size of a small tablet...I use it least for talking -- with something like the Samsung Note 4. The screen is just a bit larger, but may incur pocket-fitting issues that make it less suitable than the S4-size I'm using now. It will take some hard consideration, but I did find myself wishing occasionally for the Note 3's greater daylight readability, longer battery life and slightly larger screen, though not enough to splash out for one that isn't contract-subsidized.
I found it awfully nice to have so many truly useful gadgets in one small device...enough that I never used the other, dedicated devices I brought with me (excepting the Garmin GPS). Perhaps a smartphone would work well as your next on-bike computing solution, Richie. The voltage/current requirements sure make life easier than with a netbook. I'm putting my own very nice and barely used netbook up for sale for that very reason.
All the best,
Dan.