Chisun Lee wrote this as an Op-Ed for the NY Times:
As the Obama administration and Congress try to forge a legal framework for detaining suspected terrorists, they might want to take a close look at what's happening at the federal district courthouse just a short walk down Pennsylvania Avenue from both the White House and the Capitol.
Trial judges there have quietly decided 31 of some 200 cases brought by Guantánamo inmates seeking freedom. Dossier by dossier, the jurists have answered the core questions that policy experts have been addressing in theory: When can the president place someone in preventive detention, and how solid does the evidence need to be?
President Obama, like George W. Bush before him, has claimed the power to detain not only Qaeda and Taliban members, but also those who "support" them. Last year the Supreme Court ruled  (PDF) that the courts can scrutinize these detention decisions and overturn them if they are invalid. But the court didn't say exactly what a valid detention looks like, and Congress hasn't stepped in to make it clear.
Nonprofit news source Propublica, has a chart of where 36 of the, as of January 17, 2009, approximately 245 detainees have ended up. Here is what happened to detainees prior to 2009.