I have a Kindle because I got so excited about it when I read up on it, I just went out and bought it. I slightly looked at the Sony model that was available at the time, but I just HAD to have the Kindle right then!
And honestly, I've loved every minute of owning it. I don't have to run to the book store at any given time. I can go out and get a book by searching. It used to be much cheaper especially for new books not out of hardback yet, but about 3-4 months after buying it, some kind of agreement was made between publisher and amazon and now they sell them for about 3 dollars higher than they used to do. I still love it, though.
I read Ben Hur which is a pretty good book and a book I would have never read without having the Kindle. I got Ben Hur for about $1.
Anyway, back to the original question and my thoughts. I bought D-Day and the battle for Normandy and there are maps. And it is completely useless for maps. I couldn't see anything or make out anything. I have the early version of kindle and imagine looking at a map at about 40-45% the size it was originally made to appear. Not very good.
So, for PDFs for games, probably a very bad decision, if you could even get it on the Kindle which I am unsure is possible.