This stemmed from something Scott shared the other day. Googlios are a portfolio system from Google apps that augment what a website can do. Simply as a matter of presentation, I like the voiceover capability, as I do the mindmap at the start ala Prezi.
I've never seen one done quite like this. It would be a neat addition to the wiki, perhaps a group one. It does what Diigo does, along with many other sites, but this seems laid out very conveniently.