For any developers who are using Wave, I came across two pretty awesome robots today.
email@example.com - Prefix a blip with #!language, where language is the code language you're using. It will highlight and format the code you write accordingly. So like, #!python will assume the remainder of the blip is Python code, and will format it with pretty highlighting and such.
firstname.lastname@example.org - Found this from a link in the OP. Prefix a blip with #!dot and it will translate simple syntax like a->b b->c a->c into a visual graph. It kind of falls on it's face a little bit with heavy use, but it's a start.
Had potential but invite only made it utterly useless for it's purpose, lack of news about it or connection existing services such as gmail meant it hardly ever got visited, and people who just want stuff to work scratched their head and asked what the hell it does and how do you use it.
Oh and it apparently ran like shit, but I don't know from direct experience, - why would I bother with it when I have like, 2 friends on it (who didn't use it either for the same reason)
Great ideas, piss-poor execution. Perhaps some of it's technology should be integrated with gmail and google's upcoming social networking thingy.