I just thought I'd mention k2pdfopt. It's a program that's very simple to use and that's free. I formatted a couple of PDFs with it and I can now read them on my Kindle. It doesn't work for all PDFs though, but that's probably because I'm not familiar with all of the settings yet.
It handles small images very well, but struggles with columns and different font sizes.
It's also very slow, so I probably won't have the time to play with the settings to find the right ones.
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