The Spice Girls 11-city tour brings them to the U.S. for three shows. They will be in Los Angeles, Las Vegas and New York in early December 2007. I'm already working on getting tickets to one of the cities shows. (If your interested in the journey, let me know!)
I saw The Spice Girls live in the summer of 1998. If you want, you can read all about it on a web page I made nine years ago for no particular reason.