Utrecht IJCU still exists. They are playing first division at the moment, but have ambitious plans to step up to the Eredivisie next season. Their website can be found here: http://www.ijcu.nl/
Nijmegen Tigers is defunct. The club went bankrupt in 2003 and was succeeded by Nijmegen Emperors, who then went bankrupt in 2006. The new team is Nijmegen Devils, who are starting their inaugural season next week. Website at http://www.nijmegendevils.nl
Rotterdam Pandas have been out of action for years. I think the last season they had a team was 1994-95. No team in Rotterdam at the moment.
Liege is actually in Belgium; I am not that well informed about the league there. I don't know what happened to the Buffalo's, but the team in Liege now seems to be called the Bulldogs. Their (very nice) website can be found at http://www.bulldogs-hockey.be