Aggregating heartbeats can be an interesting social gesture. And subscribing to the aggregate heartbeat of a group can be an interesting new way of connecting with it.
Blogs are read in reverse chronological order, but their archive should be numbered like a diary, in chronological order. Your /page/1 should show the oldest posts, not the newer ones.
It's probably the most valuable thing we will carry with us for the years to come -and something we would definately want to pass on to her when she's old enough to understand.
What if kindergarten had a long term archive of kids drawings? A public one. Imagine the things you could study if you had access to kids drawings over the years...
Would it be possible to replace centralized search engines like Google, by creating a "smart" p2p search network? I think so, and in some cases, it shouldn't be so hard to.