If you're running Google Chrome's development version, or a Mac or Linux nightly build of Chromium, you can already install three sample extensions from Google developers. Two of them add some pretty nifty Gmail and feed conveniences to your browser.
They're the same kind of sample extensions we'd featured back in May, but re-implemented in the fashion of Chrome's new extension system. If you're running an up-to-date developer's version of Chrome from the "Dev channel", or a nightly build of Chromium on Mac or Linux, head to the Sample Extensions link and click the "Install" link below any of the three extensions.
The nightly build bot extension is really a Chromium developer's plaything. The Gmail checker and feed subscriber, however, add in really useful tools that Chrome users have long been asking for. If you don't see your feed reader of choice in the resulting page when you click an RSS icon in Chrome's address bar, you can customise where that RSS feed goes by supplying a URL with %s inserted where the feed should go.
Google Operating System writes that the feed handling extension will arrive installed by default in the upcoming Chrome beta that supports extensions. That's music to our geeky, web-devouring ears.