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Commentful is a service that watches comments/follow-ups on Blog posts, Digg submissions, Flickr galleries, and many other types of content. When ever there is an update, i.e a new follow-up, Commentful notifies you instantly.

Ethnio is a friendly new way to recruit people from your website for research.  Once you've selected qualified participants, you can use Ethnio to schedule them, or you can contact them immediately for live-intercept testing."