I forgot about the item cards - those are great, and really, really were a hit with my son's friends at his D&D birthday party I ran.
8 or so kids 12 and under, me running them through a D&D adventure all day. 3D terrain, Forgotten locations maps, minis, dice, item cards, legos, megabloks, actual rocks for terrain, melted styrofoam, Combat Pad, printed out spells from the SRD, packing materials...