Learning the "Programming Language Scheme"

Recently I began learning the how-to program in Scheme[wikipedia.org]. For the reader it might be interesting to note that I already program in Java, C, and Python. In the past I have also programmed in C++, Pascal and BASIC. Learning at least one dialect of LISP had always been on top of my TO-DO list. I had seen some LISP in action during my college years as part of the "Programming Languages" course, but never learnt it fully.

I finally began this endeavour after having read "Paul Graham's" essays on LISP and programming for the umpteenth time, and having read some other articles/papers etc.