Dougal Campbell's geek ramblings

Via Photomatt, I found a link to Embittered generals, which in turn led me to HTMLoverlays:

[…] The good news here is that you can do that for all your pages in your web site. They can all share the same overlay. All in all, you are going to reduce a lot your monthly bandwidth usage just because your docs will be smaller, because the overlay will be loaded only once by the browser, and you’ll improve readability and maintainability of your markup by a factor 100 🙂

Tested in IE 5+, Mozilla (and other Gecko-based browsers), Safari, and should work in MacIE. It depends on JavaScript, so it might not be appropriate for every site. But it’s still an interesting technology worth keeping an eye on.