Technology for forgetting

Anne Galloway has occaisionally written about technology for forgetting. I'm (still) not sure if this is what she means, but this example from Matt Webb works for me:

Here's a feature I want from my RSS feeder. Every so often it should silently hide one of the feeds. If I notice, and if I remember what it was is that's been hidden, I should be able to say: Hey, you forgot feed X, give it back!, and the application would say: Okay then, you got me banged to rights, here it is. If I don't notice or can't remember, the feed is deleted permanently.

I've just gone through my RSS reader and cut out about 20% of my subscribed feeds. I feel lighter somehow.