I already forgot about Google Wave… :P. Its had to do something with realtime web collaboration. After so many "days" after the invite game google finally launched it openly to the public.
Google Wave Blog – Starting today, we are making Google Wave openly available to everyone as part of Google Labs. You no longer need an invitation to wave — simply visit wave.google.com and sign right in.
In case you never heard of Google Wave before or forgot all about it … then, Google Wave is an online software application, which Google described as "a new web application for real-time communication and collaboration". Check the video below to understand how it works.
Great isn’t it. Check out some great google Wave tips and Tutorials below…
You can also check Mashable’s Google Wave: A Complete Guide (Link).