Earth Day is April 22nd, and there are lots of potential Earth Day - nano ties.  Here's a sample of resources, activities, and articles that might be relevant: 

→ Energy (general)

• NISE Net Stage Presentation: Energy and Nanotechnology [3] (be sure to read comments for adaptations)
• NISE Net Forum: Energy Challenges, Nanotech Solution [4]

→ Solar Cells

• NISE Net Podcast: Nanotechnology’s Role in Making Cheap Solar Power [5]
• Museum of Science New England Cable News segment: Making Solar Energy More Affordable [6](on solar thin films)
• Museum of Science Podcast: New Solar Cells [7] (on dye-sensitized or Gratzel solar cells)
• YouTube Video: How to Make a Solar Cell with Donuts and Tea [8] (via Wired magazine, the making of a dye-sensitized solar cell with powdered donuts, Passion iced tea, and vodka)
• University of Wisconsin-Madison MRSEC Lab: Titanium Dioxide Raspberry Solar Cell [9] 
• Video winner of the second American Chemical Society NanoNation video contest: NanoGirls [10] (they think it's fly when solar cells become more efficient)

→ Water Purification

• DragonflyTV Episode: Water Clean Up [11] (about using nanoiron to clean up pollution in soil and prevent it from getting into drinking water)
• Museum of Science Podcast: Purrifying Pollutants [12] (about using glass to remove oil from water, plus a videocast [13] on the same topic)

→ Light Bulbs

• Museum of Science New England Cable News segment: Building a Better Lightbulb [14]

→ Silver Nanoparticles

• Museum of Science Podcast: Two Sides of the Same Nanoparticle [15]
• DragonflyTV Episode: Nanosilver [16]
• Blog Post: Nano-silver: Old Problems or New Challenges? [17] From 2020science.org
• Hands-on Demo: NanoSilver Socks Presentation [18] developed by students at Arizona State University, in conjunction with the Center for Nanotechnology in Society to explore what happens to nanosilver in every day products.
• ScienCentral Video and Article: Nano Hazards? [19]

→ Gecko Feet

• DragonflyTV Episode: Gecko Feet [20]
• Images: Browse images of gecko feet in the Visualization Lab Image Collection [21]

→ Nasturtium Leaves and Lotus Leaves

• NISE Net Hands-on Activity: Exploring Materials - Nano Fabrics [22]
• NISE Net Cart Demonstration: Lotus Leaf Effect [23] (based on the University of Wisconsin-Madison MRSEC Activity: Nanosurfaces [24])
• NISE Net Multimedia Zoom: Zoom Into a Nasturtium Leaf [25]
• Images: Browse images of nasturtium leaves in the Visualization Lab Image Collection [21]
• DragonflyTV Episode: Nasturtium Leaves [26]

→ Nanotechnology and the Environment (general)

• Article: The Molecular Economy [27] by David Rejeski

Know of more activities or resources that I haven't included here?  Leave a note in the comments!