If you've got a few minutes to kill, check out the Oregon Museum of Science and Industry's podcast on nanotechnology. Anders Liljeholm from OMSI (a NISE Net programs team member who does a mean Evil Nanoscientist) answers questions like, "what is it?" "what can nanotechnology be used for?" and "what are scientists doing to make sure that nanotechnologies are safe?"
There's been some debate about the safety of nano-sized particles of zinc oxide and titanium dioxide in sunscreens-- one of the scenarios discussed in the NISE Net's Nanomedicine in Healthcare forum relates to using nano-sized particles of zinc oxide in sunscreen. However, one consumer group recently weighed in that maybe nano sunscreens are okay.