The Eighty-Twenty Solution

I haven't posted on Scheme in a while, and I know that Peter Provost, for one, has been missing those posts. ;-) Bill Clementson mentioned John Small's online book "Learn Scheme Now" the other day, and I've been reading it; this seems like a great book. John seems to have a bunch of other Scheme texts and utilities as well, though they seem to be mostly specific to MzScheme.

One other thing, does anyone know of a good reference on constructing PDFs manually? I've been wanting to play around with Schematics' PDF library for Lisp, but I'm having trouble with the mapping modes. I suspect it's like Windows progamming, where you might set the mapping mode to MM_TEXT for convenience when working with text, but I haven't figured out how to do that yet.