This page sheds light on a Chinese forced labor-concentration camp, which is thought to be the world's largest gulag. It houses about 20 million prisoners, most of them political dissenters.
This Muslim newspaper article accuses Israelis of making the West Bank into concentration camps. They credit the British Ambassador to Israel with this statement.
This page has a comprehensive listing of all known concentration camps around the world. Some of them are from WWII and even from previous years, but there are a lot of recent ones.
This is a similar page operated by a Constitutional Law professor for George Washington University. Specifically, it is an attack on Attorney General John Ashcroft.
This is a Canadian article (dated 14 July 2003) on American-operated concentration and prison camps in Baghdad. It takes a very definitely negative stand against American action and compares it to the Guantanamo Bay incident.
This is another page on the possibly existing Albanian-operated concentration camps in Kosovo, imprisoning Serbians. It attempts to reconcile the two views: Does it or does it not exist?