In a sense the "digest" is provided by Khaled, or at least it is a Forum feature in that you can go to a forum page and click 'Subscribe/Unsubscribe to this Forum' (or subscribe through the 'My Home' area). Once subscribed you get a daily email with a list of posts, and their contents, in your email.
On that note I think it is a credit to 99% of those that use this place that despite not always agreeing there are hardly any times that personal diatribe takes over from whatever is being discussed.
Here here
Regards,
