Re: Clutter Consistency
Even if this tool is more subtle than filtering by source, the matter of consistency just might be a key test for Clutter. Humans and events aren't consistent. Sometimes communications from a particular contact or about a particular topic can be very unimportant, but then there might be rare occasions when those same contacts or topics become VERY important. Will Clutter know the difference? If, for example, I consistently ignore a particular PR contact pumping a particular tech vendor nine times in a row, will Clutter suddenly realize that I might be very interested in that 10th contact, say, when the vendor finally makes a high-profile customer available or highlights truly breakthrough capabilities?
Say what you will about (lowercase) clutter, but when it's organized in last-in, reverse-chronological order, it's consistent in a good way. Yahoo! sent many email user for a loop when it suddenly imposed its "conversation" view whereby responses to earlier emails were suddenly clumped together with the original email. That made it hard to find old email messages and caused a revolt, a final straw that moved many long-time Yahoo customers over to GMail and elsewhere.
Long story short, Microsoft had better be careful with this Clutter feature, making it easy for users to experiment with it and turn it off if they don't like it.