One of the games that is available is The Legend of Zelda. (Additionally, there's the SNES "A Link to the Past", and tomorrow, Ocarina of Time is slated to be released.) This is one of the games I loved but never got to play as a kid -- we never had the game, but a friend of mine did. Unfortunately, said friend was great at playing and taking advice, but not so good at sharing controller time, so although I've seen almost every part of the game, I've never played much of it.
However, we bought it for the Virtual Console, and since yesterday, I've been having great fun playing it. I just got the Magical Sword, and have beaten the first 5 dungeons. (In Twilight Princess, on the other hand, we've only beaten the Goron Mines, which are the second dungeon, I believe.)
I love the Zeldas. I don't know why I always had such an aversion to Nintendo -- since the NES, I haven't bought another Nintendo console. I think that was a mistake. The NES was awesome sauce, but the SNES, N64, and Gamecube were awesome too, and I ignored them in favor of Sega, and later on, Playstation.
The Wii is a totally different experience, but the $5 throwbacks to the past are still totally great. (And for the NES games, you can play wirelessly... No more tripping over cables! Huzzah!)