Ask HN- Wasn't there site for people consuming iTunes U to form ad-hoc groups?

I'm digging into the Harvard Statistics class on iTunes U. The material is compelling, and iTunes U is amazing in general (shout-out to universities with videos on YouTube, and MIT OCW, etc. It's all good.)

But tracking down related URLs, texts... basically putting the pieces together or even deciding which amazing statistics class to download 20 files from... well all this stuff just lends itself to an social site.

I could have sworn there was a site posted on HN that was basically a really nice forum where people browsed ad-hoc groups that had formed around all these disparate classes. I know about OpenLearn, but that is just for OpenLearn classes. I have looked around hnsearch, and am now thinking I imagined this.

Jog my memory?