Here's another one if you travel with an iPhone or other mobile device able to read .pdf files.
Open a dropbox account (if you don't already have one) and then spend some time finding the online .pdf user manuals and repair guides for all the equipment you are bringing along from cameras to tents to bike components and bike computers. Drop all of these into your dropbox in an appropriately named folder and they will all be at your fingertips on your phone. You just have to install the free dropbox app on your phone.
You can also do this with maps and guides. For example, Oregon puts out a very nice .pdf cycling guide of the Pacific Coast that you can read on your phone. Different regions of California put out the same.
No more wondering how to reprogram your computer after a battery change or figure out how to reach that one weird menu or feature on your camera.