Neat little tool: gzthermal-web, which visualizes the efficiency of compression from gzip. Each byte is colored depending on how well it compresses; dark blue for 1 bit up to red for 9 bits. It’s a wrapper for the gzthermal tool, as discussed on Hacker News and in this sort of odd article. (Undocumented feature; append &w=1 for a wider image.)
Structure is clear. The bright yellow parts are inlined PNG images which won’t gzip very well since they’re already compressed. The dark blue chunk at the front is my calendar, a bunch of stupidly repeated HTML. Blog posts are the motley blue/green patches separated by the dark blue of the HTML boilerplate between blog entries.
I’m not exactly sure how I’d act on this information. But it looks neat!