Google Wave

[NickThissen]

It does have some other useful features. It looks pretty good actually but I don't see many people using it, in which case it's pretty useless.

The nice thing is that you can edit the conversations anywhere. You can also reply to a certain part of the message, which inserts a new conversation right in the middle of the old one. You can also make a private reply to someone, in which case it shows up as a normal conversation for both of you, but it's hidden for anyone else.
So instead of instant messaging, where you have only a single thread of conversation, or email, where you have to create a completely new conversation, independent from the old one, if you want to 'branch off', you have everything in a single 'wave' or document.

Then you can use it to work on documents with many people simultaneously. Anyone can edit the conversation (which is now seen as a document) wherever they want, even on the same line. In the end you'll have loads of broken up pieces of conversation, which you can then merge together into one document.

Also, you can rewind everything to see who made which edit and when. And then you can undo it if you want.

You can also embed pictures and videos I think. And you can embed the wave into your blog, in which case it is updated live for everyone to see.

If there's loads of users it would be very cool, but unless they're going to do some serious campaigns nobody is going to even know about it...