I'm planning on taking a computer on this trip. (This could change.) There are three upsides: I can work when I get bored, I can do something useful on the trip in terms of developing skills, and there's the possibility of the "Ukrainian National Parks" opportunity, in which I make Android apps about something sorta useful to a sorta under-served market, and thereby do something that nobody else is doing.
There is one main downside: I will lose focus on traveling and retreat to my computer. This seems less of an issue, as I'm not going to be camping in jungles or something anyway. I'm not looking for an escape, but rather a way to continue my life, just in different places. (as @garybernhardt, among others, is doing right now.) My life, at least my ideal life, tends to involve computers.
Anyway, given that I'm going to have a computer, the question is, which one? I came across a recommendation for a Lenovo Thinkpad X201, and in order to save it for later when I'm actually making decisions about these things, I will link to it here. If you have recommendations about travelley computers, I'd like to hear them.