This week I'm rebuilding my laptop and have started keeping a list of all the tools, tweaks and settings I go through whenever I do this to get it back to "square one". Some of them may be useful for readers who want to add them to an existing system.
I was already planning to share those in a blog entry, but even before I do, I just found someone who did the same thing:
http://www.nsftools.com/misc/NewComputerSettings.htm
Enjoy his/hers in the meantime.