I went to Limmud NY 2011 and wrote a lot of posts about it. Here’s a guide to them.
Elie Kaunfer, whose sessions I have successfully enjoyed at all of the four Limmud NYs I’ve been to, taught a session called “Lost Versions of Havdalah.” So here’s the usual one, from Pesachim 103a-b:
Hamavdil bein kodesh lechol, bein or lechoshech, bein Yisrael le’amim, bein yom hashevi’i leshshet yamei hamaaseh.
Who separates between holy and mundane, between light and dark, between Israel and the nations, between the seventh day and the six days of creation.
The lost one Elie was teaching, preserved in Pesachim 104a and also in a litrugical text from the Cairo Genizah begins the same way but continues with:
…bein tamei letahor, bein hayam lecharavah, bein mayim ha’elyonim lemayim hatachtonim, bein Cohanim leLevi’im veYisraelim.
…between impure and pure, between the sea and dry land, between the upper waters and the lower waters. between Priests, Levites and Israelites.
There were a bunch of other source texts and discussion of cool things. It was fun.