The 360 has tons to offer that the Wii just can't compete with. It has the whole NXE concept as well as downloadable movies to rent, themes, custom avatars, music player, dvd player, XBL, a ton of great games, arcade, XBL Vision, MSN, Windows media player. I could go on but i won't.
The Wii is getting old quick, i sold mine while the trade in prices were still high. It was fun but Nintendo need to do something serious to keep it on a competitive level.