Others have already discussed the importance of chunking and scanning issues for news aggregator UI.  What hasn't been discussed is how news chunking can be applied over time.  While there is an over abundance of news everyday, enough to flood anyone's schedule, but this is not the case for many specialized topics.  In the real world, this problem is dealt with special inserts in daily newspapers and weekly, monthly editions.  Same mechanism can be applied for news aggregators.

When a user creates a special section, user has the option of selecting frequency.  For example, I am not interested in baseball, but I try to follow news about Korean baseball players in MLB.  So I create "Korean MLB News" newspaper section with names of the players as filters, point it to sports news feeds, and schedule it to be inserted into Sunday Morning editions of my newspaper.  This way, I get a full page of news instead of one or two articles each day.  I also like to read about PGP related news, so I create one and schedule it for delivery on 15th of each Month.

By chunking news over time, I gain the ability to look at the big picture at the cost of delay in receiving the news.  For many news topics, this is a very appealing feature IMHO.