it will just be threads that I find interesting 
The process is manual -- at least for now -- so I'll be hand-picking threads. In the morning I'll likely be sending out a link to a new standalone page we created which lists the ten left-column homepage threads (called the DU Morning Digest). In the afternoon/evening I'll probably send out a link to one of the most recommended or replied to threads of the day -- unless there's a big breaking news story that we think people would want to know about.
There's going to be an experimental phase where we play around with this and figure out what people like and don't like. To begin with though, the system may be more valuable to casual DU users, rather than very active members who are here all day and read everything.
For very active members, eventually we hope to tweak the system so that we can send notifications when you get a reply to one of your posts, or a DU Mail message, etc. (Again, this would be entirely optional.)
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