Simon alerted me today to Google Wave, which made me look out of date, but I am guessing they there are many people who even later to the game than me.
You watch a really long video about Google Wave here. It is about 1 hour 20 minutes.
I think there are lots of really interesting ideas, and it is certainly possible that Wave will change the way we handle chat, email, blogging, collaborating etc.
My main doubts are twofold. 1) Anarchy seems to be preferred at the moment to systems, 2) I think the fact it comes from Google will put many corporations and individuals off (not safe enough for corporates, to much a big corporation for many individuals).
However, I do think that bits of what we see in this video are signposting some of the big changes we will see over the next couple of years.