I wish I had more than 24 hours in a day. There are so many new resources online, and even the tried and true ones are continually being updated.
It would be easy to do an entire earth science course using NOAA resources. I recently rediscovered NOAA’s Environmental Visualization Library.  The maps and graphics could be used as bellringer discussions  or students could discuss their reactions as a group activity. The site includes a series of images on the recent events of 2011 that have meteorological origins – tornadoes, hurricanes, etc. (Talk about being current–There are images related to this weekend’s storm here on the East Coast. While my colleagues are dealing with snowfall and the dreaded “wintry mix,” I’m in the midst of a nor’easter on the DE coast with heavy rain and high winds–all part of the storm system picture on the NOAA site.)
PBS Teachers Domain is morphing into PBS Learning Media, which will include even more resources. For example in the topic Life Science there are now more than 1800 resources (compared to 770 in the previous version). The resources, which include videos, PDF files, lesson plans, and images, are searchable by grade level and subject area. You will need to re-register for the new service, but it is still free for teachers.
The Chemical Heritage Foundation recently posted the videos in the It’s Elemental contest in which students submitted videos of the elements. Click on the name in the period table to see them. I looked at some of the uncommon elements to see what students would do with them–very creative! Another variation is the Periodic Table of Videos from the University of Nottingham
Scientists @the Smithsonian has profiles of 20+ scientists who engage in a variety of research projects, with intriguing titles such as Coral Whisperer, Art Scientist, and Dietary Detective. Of course it’s important for students to learn about scientists from a historical perspective, but it’s equally important for students to see the work of contemporary scientists. The profiles include video interviews with clips of the scientist in action.