Guid vs Int

http://www.uml.org.cn/net/200512283.htm

http://www.cnblogs.com/twodays/archive/2004/07/19/25562.aspx --对Guid应用非聚簇索引

http://www.codinghorror.com/blog/2007/03/primary-keys-ids-versus-guids.html

http://www.cnblogs.com/zhenyulu/archive/2004/07/20/25816.html

http://blog.miniasp.com/post/2008/01/08/The-Gospel-of-the-GUID.aspx