Teams this year include defending MLS champions Houston Dynamo (also won the Carolina Challenge Cup last year), New York Red Bulls and new MLS team Toronto FC. It's a great preseason tournament, check it out.

Major League Soccer Champions Houston Dynamo return for 2007 Carolina Challenge Cup

This year's schedule has been announced:
http://www.charlestonbattery.com/news.asp?id=284

Claudio Reyna has already signed with the Bulls and CNNSI is reporting Rivaldo has signed and DeMarcus Beasley is in the pipeline, could be a great chance to see some quality players visit the lowcountry.

http://cgi.cnnsi.com/2007/scorecard/01/30/truth.rumors.soccer/index.html