Plastic bags, lectronic parts, broken electronic devices, little bolts, posters, samurai-related items, miniature swords (specially katanas), cool videos that I find on the web, manga (Rurouni Kenshin, Dragon Quest, Bt'X, . . .), Robotech comics, action figures of my favorite anime & videogames, anime & videogames merchandising, . . .
When I was a child I used to collect beans, Mazinger Z Dragon Ball Z and Captain Tsubasa stamps and stickers, Pokémon postcards and "Tazos" (they came with the potato chips and Dorito's), DBZ "Yokos" (also with the potato chips) and small figures of Disney, Dragon Ball, Hanna-Barbera, and Rugrats