When I look up a current news topic I'd find pieces written in the last couple of hours. Refresh the site as often as CNN refreshes Headline News. It's the next level of competition in search engines. I believe that before the November U.S. election, we'll have such a site in place. It'll be total killer, just like Alta Vista was when it first came out.
Most software assumes the user has a single machine.
If you can relax that assumption you can build a whole new kind of software, stuff for users who have a machine they can delegate tasks to. After a half-decade of dreaming about personal agents, I think we're finally ready. I have the need myself, since I receive hundreds of email messages a day, many of which contain valuble information that I'd like to use or refer to in the future. People with an extra computer can have their own search engines. All their written work is filtered, cross-indexed and sorted.