The photos are huge too and somehow make me completely lose place and orientation. I have no idea how to fix it though. It could work on wide screens (would work on 1680x1050 already) if you placed images and text side by side.
My challenge has been that I want to keep the paragraphs of text short, which makes it difficult to place floating-elements since there isn't much text to float them against.
The images I've wanted to keep large. I like the aesthetic of the Big Picture type of blogs, but you may still be right that it's not appropriate for what's supposed to be a learning guide.