I always find this stuff interesting.
What I have isn't necessarily memorabilia but, one thing my Grandad did was have his friend record all his life stories and put them on a CD. There are two CD's in total of just him talking, crying and laughing. He made them about 4 years ago, he passed away last year.
Everything from his childhood memories, Friel Coal Business, WWII stories, the fail of his sip-n-stuff business, the start of Green Vally Golf course and everything in between.
So anyone with an older family member that has a lot of knowledge on family history, this might be an idea.