I use the main starter box to keep the books. Inside the main box, on top of the softcover books, I keep the Players Toolkit box which has all of my large format (polaroid sized) cards and character sheet pads (as well as pencils, etc). Also in here is the charcter 'boxes' that keep all the bits and cards for current characters and a big zip-loc bag with all the dice.
For all of the fiddly components, I got this Stanley organizer. All of the little compartments are actually removable trays of varrying sizes. The largest ones can fit the full sized (i.e. Action) cards, the medium sized ones are perfect for all of the tiny format cards (i.e. wounds, talents, etc.), and the smallest little boxes are perfect for tracking markers, stress/fatigue markers, stance track pieces, and the like. The little containers are perfect becuase I can take out the ones I need, set them on the table, and set the organizer off to the side, or under the table out of the way.
When I first bought into WFRP, I got the main box, Player's Toolkit, GMs Toolkit, A Gathering Storm, and The Edge of Night box sets. At that point, all of the cards and components (even the dice) fit into this container perfectly. But I recently got back into the game and started catching up with the expansions…picked up Signs of Faith, Winds of Magic, Omens of War, Black Fire Pass, and the Creature Vault….I even got another starter box set for duplicates of the basic action cards and really to get another pile of dice because they are out of print…so needless to say the card and component count has gone way up. I'm transitioning the standard sized card storage to those 3x3 baseball card sheets that go into 3-ring binders. I now keep most of the monster stand-ups in the Stanley organizer, and the character standups are kept in a seperate zip-loc bag since I only really need them for character creation…I will pull a few out for NPCs from time to time and keep those in the Players Toolkit box with other current adventure specific components.
So far I havent gone the card sleve route, but am contemplating it…especially since I am getting close to making and printing some new cards using Strange Eons.
If anyone is interested in seeing how I organized everything, I will take a photo later and post it up.