Google Wave. It stole the thunder of bing and deservedly so. It is the difference between a completely proprietary search system and an open source system that integrates many of the paradigms of the modern Internet. It is the difference between a "me too" system and something "new".
I think wave has the potential to make a big difference. The one thing that struck me was how much those aspects that make a Wiki are integrated already. The usability of this still very early product is awesome. When you see this demonstration and you think Wikipedia, you may find like me that much of the functionality is already there.. Sure I have not seen the "flagged revisions" or the "citations" but both will be the kind of functionality that so many people / organisations will need that I am sure that that will happen.
What do you think, is this the kind of open source functionality that would fit Wikipedia?