I also put together these little envelopes--one for each country (color coded...except they only had 3 different colors, so Germany gets stuck in a clear ziploc bag. My bad). In them, I put things that are specific to that country, things that I would not need until I am there.
For example, I have the appropriate language translator guides for each (cut apart from a German/Italian/French combo language book), the train or flight tickets to leave that particular country, and sections of the Rick Steves books I had that pertain to specific things we will see in that country (for places that do not have audio guides that we are planning to rent)
We bought two cheapie mp3 players, and I have downloaded a bunch of audioguides to take with us, so we will better understand the things we are seeing (the Pantheon, Notre Dame, St Peter's Basilica, Sistine Chapel), in areas where we don't have a tour guide or a rented audioguide. Does me no good to be somewhere awesome and see something beautiful if I don't know what it is or the stories behind it. Ethan was not a big fan of being tied to Tobias when they shared audioguides on his last Europe trip, so we got separate players. No short leash to tie us together!
Anyway. I have planned. I have thought carefully. All contingencies were deliberated upon. Except volcanic ash. We shall see. An Atlantic storm on Weds/Thurs may push things northward and save the day.