There’s a wp-cron.php in WordPress 2.1, but there’s no documentation, and no UI for it in the admin screens. I would love to see a control panel for it that allowed you to enter some URLs that you wanted fetched and cached on a regular basis. It could even sanitize the returned data. Then you could use an XMLHTTPRequest wrapper to decorate the page with the cached data. If you were caching HTML fragments, you could set up bindings to named DIVs on the page, and use AHAH.
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