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Maybe I should change the name of this blog to WOW and then start every post with wow.
Wow. HTML5 bookmarkable infinite scroll example. Infinite scroll itself is cool, although it's not terribly new - basically instead of forward and back buttons (or previous and next) to page through content (like a blog), infinite scroll just loads new content in the background using asynchronous calls to the server as you scroll. So, for instance, as you get close to the bottom of the page some javascript calls the server, asks for more posts, and then they magically appear so you can keep scrolling. This way you can read a whole blog on one page, but you don't have to load the whole thing in at once (and you don't have to load a ton of content yo don't need in the case that you don't scroll all the way back which would probably be the usual case).
The cool thing in the example here is the use of the HTML5 History API - specifically replaceState - so that the URL changes as you scroll, thus making any point on the infinite page bookmarkable.