Bicycle Geometry 101? Are there any resources or books that discuss bicycle geometry? I am looking for resources that would allow to get a rough idea of how relaxed or aggressive a particular bicycle geometry is, by looking at the manufacturer's geometry specs. I realize that it would only impart a very rough idea and that only a prolonged test ride and preferably long term use of the bike can impart a full impression.

I am mainly interested in traditional road  and touring bikes, but resources that address the same question in hybrids, and other bike styles are also welcome.
Tim Paterek Manual for Bicycle Framebuilders contains the chapter on geometry. Very old version of this manual can also be downloaded for free.