Goodness! I have so many things that I treasure, I'm sure I'll be coming back to this thread as I think of something new.

Hmmm... coming most immediately to mind is a recipe book that's been in the family for ages, The White House Cookbook. You can buy reprints now but they're just not the same as the original!

I treasure ALL of my Sophie pictures. (And even some "dumb" things that she chewed the corners off of.... books, scrap pieces of paper, etc.).

When I was little, I started a "whisker box." It's a box-shaped coffee can that I decorated with stickers; inside are whiskers (with labels to note the name & date) from all my furbies. (There's a few pieces of fur and one baby tooth a'la Tinkerbelle, too!)

I also have a collection of antique books and antique pencils.