Did you ever sell/throw away something as a kid only to want it back as an adult? I had a ton of systems - from the 2600 on, that either died or were sold over the years. I remember in college getting into trading concert recordings, and trading this one guy all of hte 2600 stuff in my parents attic for a ton of concert bootlegs... The stuff I miss the most was oddly enough an old Turbografx that I had picked up cheap after they had been discontinued. I don't know if it was because no one else has one, or that the games are unavailable in collections or what, but I think I might have to hit ebay soon and pick up another set.
So I pose the question... what do you most regret parting with back in the day?