Okay, there are different kinds of badness - along the Io lines, I remember the photo gallery perl program called "web album". Couldn't google it for love or money.
The problem with git is that it is the kind of word that seems to (unjustly) infantilise hackers as far as management is concerned.
But hemlock is definitely worse. If you ever had to sit through a gruesome description of Socrate's death, you'd understand my reaction. My Pavlovian response is "Mmmm Hemlock, excruciatingly painful killer of goodness and smartness".
I'm way more interested in using Flash only for communicating with XMPP and rather do the rest in HTML/CSS/JavaScript. Also with a fallback to BOSH, so it will work for those without Flash too.
It looks like the server-side stuff will be in Ruby (the About references Ruby inspirations), but I couldn't find anything specific on what you'd code other than XMPP and Flash.