January 10th 2007, I demoed a set of logins across three different federations using different technologies in Europe.
I demoed both SPs and IdPs located in Spain (RedIRIS) using PAPI, Norway (Feide) using SUN Access Manager and SAML 2.0 and Switzerland (SWITCH) using Shibboleth.

Five different attributes were sent between the briding elements.

The picture above is from the Feide attribute viewer showing attributes from a SWITCH test user account.