Coda Notes: a Safari Extension
panic.com
panic.com
Back on-topic: it's great that Safari is now offering an official way to have extensions. I had tried at one point to write a plug-in for Safari and soon realized that the existing ones (e.g. 1Password, Evernote) relied on "hacks" and work-arounds. Let's just hope the extensions are as easy to develop as for other browsers, like Chrome. (with which I recently dabbled with)
Also, if you didn't notice, every time you refresh you get a new random rotation.
I wonder how closely the Safari Extension Gallery will follow the Dashboard Widgets Download page: http://www.apple.com/downloads/dashboard/
Mozilla, in addition to their normal extension architecture, has been developing another type of extension, using the same technologies that Apple is using here: Javascript, HTML, and CSS. They call their framework Jetpack: https://jetpack.mozillalabs.com/