Just ran into this the other day and I thought I would share it.  I have a application that I recently converted over to CF8 and ran into a small snag.  I was using Illidium PU-36 Code Generator and had a table called roles, user and an associate table called userroles.  Well one of my services had a method called getuserroles().  When I ported this application over on a CF 8 Server and ran the application it turns out getuserroles is now a Coldfusion function.  CF8 threw an error telling me I basically need to rename that method.  Once I did and made the changes in my Flex Remoting calls the app worked just fine.  Anyway lesson learned.... something to avoid, especially when using code generators.