There is quite a lot of these games on my list !
Some I have especially preserved to play them later - a stupid idea because they won't become better with age
Others I have never played because I always thought they would to time intensive to play, so I thought I will play them later when I have more time (in fact I have less and less time...
And, I have also become a little bit of a lazy gamer, so I like to play games which are not that long and easy completeable.
Some I always wanted to play but probably will never:
Abandoned Places II
Faery Tale Adventure
Heimdall I & II
Dragon's Lair Series
...and probably some other RPGs like Crystal Dragon, etc.