As soon as I get a hold of Zelda: Collector's Edition, I will play the first two Zelda's for the first time.
It's hard to believe since I'm such a big Mario and Zelda fan, but I've never even played the original Legend of Zelda, Link's Awakening, Adventure of Link, Oracle of Seasons, or Oracle of Ages.
Come to think of it, I've only played the original Super Mario Brothers ONCE, and it was when I was six-years-old; and I only played it for a few minutes at an arcade.
So I better move Super Mario Brothers up near the top of my most wanted list. ;)
EDIT: Wow, I didn't realize how much I went off topic. XD