I'm working my way through the full series of Buffy: The Vampire Slayer (wonder if there really should be a colon in there or not) on Netflix. I watched most of the first five seasons when it was on the WB but lost track of the series when it moved to UPN for the last two seasons.
That meant I didn't get a chance to see "Once More With Feeling", the nearly-all-musical episode in season six. Turns out it's pretty spectacular. Who knew?