Googlebot hits my index page every 3 minutes

[Spacefreak]

Background: my site is 2 months old. It features mostly aggregated rss news stories from around the web, updated numerous times per day.

Why on earth is Google hitting my index.htm page every 3-4 minutes? This has been going on for at least 2 weeks, and I'm not seeing any indexed results.

The visits are from 66.249.65.#*$! and 66.249.66.#*$!... about 3200 visits over 2 weeks.