I just noticed a neat feature that a friend has on her blogspot blog. "Check here to be notified by e-mail when a new comment is posted". I am liking this feature and I'm wondering if there is something available here at WordPress or an outside source that I could use here. I have a lot of readers outside of WordPress and I would imagine that they would appreciate being able to choose to be notified when a comment is posted after theirs - hence the discussion forum style of commenting.
She uses HaloScan and I can't determine if it's usable here at WordPress or not.