I don't think that there is a direct link between Autism and Hoarding. But, there seems to be a common thread of behaviors listed here in the responses. I also have kept what I explain to my wife as a backup computer, a 2nd back up ,3rd, etc., a collection of "omni" magazines, readers digest, computer magazines, that I might reference later (Google took care of this), sound receivers, TV's, an acoustic piano although I only use an electronic one, horrible time getting rid of cars I had a long time that I took meticulous care of, video game consoles and associated games, saving MRE's for the next hurricane, etc.
For me the common thing was they were all part of special interests that I became obssessed with. I don't know how anyone else feels, but there have been times in my life that I have been so focused on special interests that it seems like the special interests are part of my identity, and letting go of them feels like letting go of a part of me. I would never hold on to anything if it wasn't part of a special interest pursuit.
My wife had a family member that was a hoarder and often expresssed concern that my obsession with special interest related items might turn into hoarding, but I assured her this was not the case because my collected items were neatly stored away and well taken care of.
Here is a quote from this link: http://www.autism-help.org/comorbid-obsessive-compulsive.htm
Quote:
Obsessive-compulsive disorder can be a common comorbid condition with autism and Aspergers syndrome because of the tendency to become fixated and obsessive over certain ideas, objects and activities.
My wife has OCD: germaphobe, towels have to be straight, etc. and she readily admits it, but she will never be a hoarder. This is clearly the kind of thing that I have associated with OCD, but since I didn't have the common traits, I didn't think I had any form of it. But now that I am older and some of the coping mechanisms I used in life no longer work, I realize I was obsessed with my coping mechanisms (strict routines to exercise, certain fabrics in clothes, certain brands of clothes that had a comfortable fit, etc.). I thought life was kind of like science, you experiment, find the things that work, and keep doing them, change was to be avoided because it might mess up the experiment.
I know my wife was afraid it was hoarding, so others might mislabel it as such. While I'm not suggesting that anyone posting has "OCD" or is a "Hoarder". I think the common behaviors people are describing are associated with Autism. While there are common elements of some of the behavior in the general population; they seem to be more prevalent with folks on the AS.