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http://www.schemers.org> is a good starting point for all things Scheme.
http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme.html>. Includes a nice explanation of continuations.
http://mitpress.mit.edu/sicp/sicp.html>. This site also provides teaching materials related to the book, and all the source code used in the book, in a form suitable for loading and running.