I just started using the Less Wrong Study Hall. It's been great! I find myself to be more productive, and there's something fun about being amongst the company of other friendly people.

I don't have anything insightful to say. I'd just like to reiterate that:

1) It exists and you should consider using it (it seems that not too many people know about it).

2) I (and others) think that there should be a link to it in the sidebar.