just forward the X auth (in other words, use -X in every ssh connection) !
Code:
[miguel@babylon5 ~]$ ssh -X miguel@servera
Last login: Wed Jul 16 17:56:41 2008 from 192.168.160.137
Have a lot of fun...
miguel@servera:~> ssh -X miguel@192.168.160.250
Password:
Last login: Wed Jul 16 18:01:29 2008 from servera.apicenet.com.br
Have a lot of fun...
miguel@minibit:~> xclock
Warning: Missing charsets in String to FontSet conversion
Warning: Unable to load any usable fontset
(xclock was displayed in my workstation, aka, babylon5)