Google Wave was unleashed for public testing recently, with 100,000 invites being sent out; and with those a batch of invites, tied to the invites (think Gmail at it’s inception).
Catch the Wave, it’s setting itself to be the most interactive, social media collaberation idea out there. Email, instant messaging, documents, which can be edited by a list of people selected by you, it’s a step to making the internet just a little more accessible. Google has a love affair with making information freely available, from their book digitizing (currently on hold), to the actual search engine and indexing of the majority of the internet, to handing out free services like Gmail, and now the Wave service.
Wave itself is still a good few months off yet, admittedly still buggy in their own blog writings, but when the Wave gets rolling, it would be best to be on it and ready for the ride.