I loved those Giant Canisters that came with the boatloads of parts (Ultimate ___ Accessory Kit). I still wish I kept the cans, but I was too young to know that I should keep them.
Does anyone remember the Kanoka Cards? You would get them in the 2004 sets and it was a small card that had a code that you could use on the website to unlock games and printouts. I loved those things.