When I locate new science rss feeds, reputable resources, I add them to my public N2Teaching Science PageFlake. Earlier this month, I found websites that relate to Biology, Chemistry, Oceanography, Physics and other sciences. I hope you will take a moment to look over the other rss feeds in my public PageFlake Focus on Science.
Images created are referenced to Joe Landis, of the National Science Foundation. The original websites fed into this Science PageFlake belong to very reliable science research groups who are participating in the US Polar Year 2007-2008. There is an rss feed for the general public, and you can also find several rss feeds intended for teachers.