Same URL issue, different problem

[Steven Roussey]

We are doing everything in UTF-8 for our next few site launches, and want to
be able to support international domain names and unicoded user names (with
their own subdomain or url directory). 

I remember there being issues with browsers being tricked by similar
*looking* domain names. How do we deal with this when we use URLs as
identifiers? Surely someone has already dealt with it, so I just need a
heads up on what to do.

Thanks,
-steve--