SEED Magazine is another great resource out there for High-School and above.
It’s a bit like NewScientist, though with more appeal to the i-generation, with a good format and some really thought-provoking articles.
– the Daily Zeitgeist (look it up) wraps up 5 stories daily, and can be subscribed to via RSS (see the right-hand column on this blog to see what I mean).
– Cribsheets: decent in-a-nutshell posters on topics from photosynthesis to string theory. Well worth printing and sticking in the space where that Westlife poster used to go.
– Video interviews