Here are some recommended websites.
College Confidential — Help to demystify many aspects of the college admissions process.
Epic Reads — Book related stuff aimed at teens.
Reading Rants — Fun book lists and book reviews for teens.
TED — A nonpartisan nonprofit devoted to spreading ideas, usually in the form of short, powerful talks. This is where the TED Talks come from.
Teen Ink — Dedicated entirely to teenage writing, art, photos, and forums.