1. Motion sensing stuff was really fun and different.
2. Virtual console. My NES no longer works, I can't find many of my SNES games, and I never owned a N64. I've had the Wii almost a month and a half and I've downloaded 4 VC games and bought 1 Wii game.
So far I've gotten a return on the $250 I paid for the Wii. When MP3, Galaxy, and SSBB come out in addition to the great 3rd party games that are on the way... well, let's just say I'll be extremely happy I bought this thing. It truly is a great value.