[rradu]

I've been using js-kit, or Echo as it's called now, since they first came out a few years ago. They've had some problems before (slow loading, delayed moderation), but they've been good lately.

I like that you can style the comments almost any way you want them with custom css. I like the analytics they give me, and the fact that they're pretty versatile with what they offer (custom html, video/picture embedding). Of course there's also the social aggregation feature which is pretty cool if you find it useful.

The pricing is a bit steep though.