Commenting On Commenting

Much has been made recently on the interwebs about what and how much to comment code. Do we document every single line? Just the broad ideas? Does good code require no comments? In this roundtable discussion, we'll (politely) debate as a group the ideas about commenting and discuss our own styles of code comments. A consensus isn't required; just a broad overview of what's out there and what people think.

Note: this will be a discussion so come prepared to participate!