"The Mythical Man-Month: Essays on Software Engineering" and the paper "No Silver Bullet — Essence and Accidents of Software Engineering", both by Fred Brooks, is where I found the most valuable lessons on how to build software. (+1.5) GoF is for sure the second one. (+1.5) It showed me the full potential of OO concepts (Inheritance, Polymorphism, Encapsulation, etc.). "Refactoring: Improving the Design of Existing Code" was a book that I've never read, but i know every concept there from people that read. Although I don't feel the need to read it now, I think it is a important book that brought important practices to light. (+1)

There is one feature in BugTracker.NET that is just great. There is a windows application that captures the screen and you can draw on it and send directly to the bug tracker. Here, we changed a few lines on this C++ application so now it does not need any configuration file to run. Every single user here has this app installed on their machine.

You can try my old (still working) project... http://www.dalssoft.com/diagram/[^]