As a pseudo follow up to last weeks encryption post:
I like portable apps. Install some of the greatest open software tools you need on a memory stick (usb flash drive), and run the applications from there.
Damn Small Linux usb install. Like the above, but it's the whole OS on a stick. You can boot from it (if the computer supports it), or run it inside MS Windows.
Yes I know other distros can do the same thing, I just happened to like DSL.
And one of my new favorite tools. Even if the Beginner's guide is 339 pages is Helix. I've been playing with this for work. I'm looking into using this as a special audit tool.