I haven't because there aren't really any games on there that grab me. I've got all the SNES and NES games on my computer, so I don't forsee me using that all that much. I am planning on getting Tecmo Bowl when it comes out on the VC, but that's probably not for awhile. I have heard a lot of people really enjoy the VC, though, especially on the older systems.
I'm really looking forward to the other channels they'll have on there. Opera should be coming out for the Wii this month, and they'll have the news and weather stuff on there shortly, too.