I came across on posting series that describe Microsoft codenames. It is good to see all them in one place but it is a bit confusing and overwhelming :)
You won't be surprised that many new things are behind the corner... Check Mary Jo Foley's series of Microsoft Codenames.
(via DevLife blog)
There is also good list on Wikipedia. I found there that "Tuscany" is codename of online version of Visual Studio and it is currently a research project. Interesting, huh!?