New Feature in Google Wave

a new option has appeared in the left menu, "Extensions", and it adds a variety of tools like Mind Maps, Likey (+1), Y/N/Maybe (quick poll), Napkin (drawing), Pollo (surveys), highlights and video chat. If you don't reply in the Wave, but instead just edit it like a document/wiki, you actually have a "live" doc. Unlike Google Docs, you can see the other people making changes to the doc in real-time, ie. character by character - along with a tag showing who is doing what

thanks to Nathan Bailey for this tip