Canada Palestine Support Network (CanPalNet) offers the following guide on this issue.

On April 1, 2011, an opinion piece by Richard Goldstone was printed in The Washington Post.

Reconsidering the Goldstone report on Israel and war crimes
Richard Goldstone, The Washington Post, 1 April 2011

http://www.washingtonpost.com/opinions/reconsidering-the-goldstone-report-on-israel-and-war-crimes/2011/04/01/AFg111JC_story.html

In essence: “If I had known then what I know now, the Goldstone Report would have been a different document.”

There are many thoughtful commentaries on Richard Goldstone’s “reconsideration,” and many reach the same conclusion: “That this mea culpa has nothing to do with new facts is clear when one examines the "evidence" brought by Goldstone to explain his retraction.”

Goldstone's shameful U-turn
Ilan Pappe, The Electronic Intifada, 4 April 2011

http://electronicintifada.net/v2/article11895.shtml

How, then, should we view the report of the United Nations Fact Finding Mission on Operation Cast Lead, an operation that, from 27 December 2008 to 18 January 2009 left more than one thousand Gazans dead, many more injured, and the infrastructure of a territory under siege destroyed?

Human Rights in Palestine and Other Occupied Arab Territories: Report of the United Nations Fact Finding Mission on the Gaza Conflict
Human Rights Council, United Nations, 15 September 2009

http://www2.ohchr.org/english/bodies/hrcouncil/specialsession/9/docs/UNFFMGC_Report.PDF

You may recall that the report was not received without criticism.

The Goldstone report and the battle for legitimacy
Richard Falk, The Electronic Intifada, 22 September 2009

http://electronicintifada.net/v2/article10788.shtml

While acknowledging it as an historic contribution to the Palestinian struggle for justice, Richard Falk noted: “[in] substantive respects the Goldstone report adds nothing new. Its main contribution is to confirm widely reported and analyzed Israeli military practices during the Gaza war. There had been several reliable reports already issued, condemning Israel's tactics as violations of the laws of war and international humanitarian law.”

(For one such example, see:

Operation Cast Lead: 22 Days of Death and Destruction
Amnesty International, 2 July 2009

http://www.amnesty.org.uk/news_details.asp?NewsID=18294 )

Falk also examines how the report falls short of Palestinian expectations, writing that it takes for granted “the dubious proposition that Israel was entitled to act against Gaza in self-defense, thereby excluding inquiry into whether crimes against the peace in the form of aggression had taken place by the launching of the attack.”

Nor did The Goldstone Report comment upon the Israeli closing of all crossings during Operation Cast Lead, denying a refugee option to the civilian population trapped in the Gaza Strip. As Falk argues, “[the] importance of this issue is reinforced by many accounts of the widespread post-traumatic stress experienced by the civilians in Gaza, especially children, who comprise 53 percent of the population.”

It is also worth remembering, as John Dugard does, that Goldstone himself does not describe his opinion piece as a retraction. “This is not surprising. Richard Goldstone is a former judge and he knows full well that a fact-finding report by four persons, of whom he was only one, like the judgment of a court of law, cannot be changed by the subsequent reflections of a single member of the committee.”

Where now for the Goldstone report?
John Dugard, New Statesman, 6 April 2011

http://www.newstatesman.com/blogs/the-staggers/2011/04/goldstone-report-israel-rights

The other three members – Professor Christine Chinkin of the London School of Economics, Ms. Hina Jilani, an advocate of the Supreme Court of Pakistan, and Colonel Desmond Travers, formerly an officer in the Irish Defence Forces – do not share Goldstone's misgivings about the report.

Goldstone report: Statement issued by members of UN mission on Gaza war
Hina Jilani, Christine Chinkin and Desmond Travers, The Guardian, 14 April 2011

http://www.guardian.co.uk/commentisfree/2011/apr/14/goldstone-report-statement-un-gaza?INTCMP=SRCH

CanPalNet stands in solidarity with the victims of this conflict, who continue to live in difficult and unsafe conditions under an illegal blockade and without remedy, and with Palestinian human rights organizations who “continue to call upon the international community of states to abide by their obligations under international humanitarian law by moving this legal process forward. On behalf of the victims and survivors, we remain committed to advancing the cause of justice at the UN general assembly in September 2011 in order to finally pursue accountability for the commission of international crimes and redress for the victims.”

Justice for Gaza conflict victims: a response to Richard Goldstone
Open Letter to Richard Goldstone from Palestinian Human Rights Organizations, The Guardian, 7 April 2011

http://www.guardian.co.uk/commentisfree/2011/apr/07/richard-goldstone-report-gaza?INTCMP=SRCH