Seconded! (Although I imagine John & co. already know it needs restoring. Besides, it's fairly quiet here at present, and I imagine it'll stay so until major problems - e.g. that comments on tag pages don't yet appear - get squashed.)
The 'most commented on' list was probably one of the main features that held this community together, imho. While comments dropped off the end of the feed it continually reminded us of where the main action was at any given moment. It was a place to congregate. It caused so much else to happen. Can we have it back, please?