Software Design

Protyping: http://www.epri.com/eprisoftware/processguide/swproto.html

OO Tips: http://ootips.org/
Agile Modeling: http://www.agilemodeling.com/essays/simpleTools.htm
OO for Java: http://www.ecs.umass.edu/ece/wireless/people/emmanuel/java/index.html