It's an interesting question.
I've recently written a will but I couldn't get a handle on what I want to happen with my negatives, slides and even the digital files I have on my external hard drive.
It's not as it they have any intrinsic financial value - it just seems a shame, having travelled around the world and taken so many shots of the people and places to which we've travelled, to just bin it all when I 'pop my clogs'.
I post some of my digital stuff on my website and other photo forums / galleries and I've had a few prints made of some of my better work. However, much of my output sits gathering dust in my one-person image library, slide boxes and negative folders until I re-discover it and do something with it.