Hi folks, Care to shed some light into the GUID vs auto-increment debate? http://dema.ruby.com.br/articles/2005/09/14/guid-uuid-as-primary-keys-in-rails There´s also an experimental GUID extension patch for AR available that you can use to try it out yourself. Cheers, Dema -- http://dema.ruby.com.br - Rails from a .NET perspective