The Scheme Programming Language  and Teach Yourself Scheme in Fixnum
Days  are available online and are good, fast-paced introductions to
scheme if you already know how to program.
How to Design Programs  is a more general book, and like SICP  has
more to do with ideas about process and computation then with the
language itself (i.e. syntax and the like). if you know how to program,
HTDP may be a litte boring, but SICP will be mind blowing if you are an