GMail changed the way we use email. It gave us conversations. We started using labels and searches instead of trying to manage folders. It spoilt us by giving us extensions (labs) and themes. It integrated chat and video into the email. And, we started to expect a lot more from web applications.
Google has just unveiled the next big thing they have been working on – Google Wave, and I can safely bet that it is going to have a much bigger impact on how we communicate than GMail did.
I just finished watching the Google Wave Developer Preview at Google I/O 2009.
It is absolutely mind blowing. Not only in how completely it changes the way we think about online conversations, but also in how much the Google team managed to do in the browser. Amaazing!!!
Go watch it now. It is an hour and twenty minutes, but it is time well spent :).