Sensible Internet safety guide from the Girl Scouts.
LMK (cyber-speak for "let me know") takes a refreshingly common-sense approach to online safety: Be savvy -- not scared -- and teach your friends what you've learned. The information provided is smart and thorough (though sometimes a bit redundant), and teens should appreciate hearing what their peers have to say on the subject. Editorially, the site is a little rough around the edges, but it's off to a good start.