It's my first time through The Little Schemer, and I've been using Arc instead of Scheme because... well, because it's just so pretty. I could post my files thus far on a wiki if anyone would care... I'm currently on Chapter 8.
I just finished this book and I don't think you'd find much benefit from trying to use arc instead of scheme. The Little Schemer as about computation, not practical programming.
In fact I wonder if anyone has ported pg's Arc macros to Scheme... it seems a lot of the benefit of the language would still be there without a full Arc syntax implementation.
It could be seen as an experiment to see how much an Arc without special language extensions would feel like the real Arc - eg. minus square brackets etc.
My feeling is that merely having nice short abbreviations buys quite a lot - but hell, Ive written mostly C code, so you may rightly cringe at the lobotimization.