I'd like to see games from publishers that are long since gone. It would be cool to see good games that never made it and we probably never heard of because of bugs or bad marketing.
One example would be "The Hive," made by Rainbow America and Trimark Interactive, companies that have been long dead. The game was a rail shooter with a twist, where certain sequences in the game allowed you to stand still and pan around your character in 360º, where you had to shoot at enemies that might be coming at you from all sides. It was very fun and pretty difficult. It also works fairly well if you happen to have one of those high-end light guns for the PC. But I can only get this game to work properly to work in Windows 98, which is annoying because I have to pull my old CRT monitor out of storage, since my Windows 98 machine doesn't work on my 30" LCD.