Someone in Trenton, New Jersey, is hammering the RSS feeds in CAREO. Sending fresh request for a bunch of RSS feeds every minute or two. They're currently running over 70 simultaneous sessions in CAREO, but this has been over 300 in the last few days. They're not running a webserver on their IP address, so I'm guessing it's a desktop aggregator set to "stun".
I don't think they mean to be sending all of these requests, but this really underscores the need for caching RSS feeds (either at the aggregator/displayer or at the repository level).
We're looking at migrating to a new server in the next while, which should help alleviate some of this load.