I subscribe to about 25 newsletters. For a long time my relationship with them worked like this: subscribe with genuine excitement, read the first two issues, then watch the rest pile up in Gmail until the unread count made me feel bad enough to archive everything and start over. The problem was never the newsletters. Most of them are good. The problem is that "good" and "worth my time this week" are different bars, and an inbox can't tell them apart. Every issue lands with identical urgency,...