Below is a link to the fake op-ed. The page is designed just like a New York Times page, but you'll notice that the URL is wrong. The word "opinion" precedes the "nytimes.com" - the real URL for NYT opinion pages is:  nytimes.com/pages/opinion/i.... Many phishing websites use words, preceding the "official" URL as a way to spoof websites and mislead people. The fake website was incredibly intricate and well done, which helped the op-ed spread quickly.

[Update: Wikileaks is now taking credit for the fake op-ed:  twitter.com/wikileaks/statu.... "Yes. We admit it. WikiLeaks (Assange & co) and our great supporters where (sic) behind the successful NYTimes banking blockade hoax on @nytkeller." h/t to Ernie Smith at ShortFormBlog for tipping me off to this news]

It's unclear how long this webpage will stay live, so below is a screenshot. 

In under an hour the piece had spread rapidly including being link to by New York Times tech columnist Nick Bilton.

By morning Bill Keller had responded strongly and others began to correct or delete their earlier tweets.

Chris Soghoian pointed to these two tweets from accounts associated with Anonymous and Wikileaks around 1:00 am on the morning of July 29th as the first two tweets about the op-ed.

However, Theodora Michaels found an earlier tweet from @Block_NYTimes, posted just after midnight. 

Zeynep Tufekci and Christopher Soghoian looked up the WHOIS info for the URL and found that this stunt was in the works since spring of this year. And @shawnmer tracked down some clues in the code of the fake op-ed page. 

It turns out that Bill Keller's twitter account may have also been hacked and a fake Bill Keller account was created.

From Nick Bilton's Flickr page: "The account above looks real, right? Bill Keller's name, photo and URL are all correct. Most importantly, his Twitter handle reads: @nytkeller. Well, it turns out this is actually a fake Twitter account. After suspecting something was off with the account — namely that it didn't have a little blue "verified" symbol next to it and didn't show an accurate follower count — I discovered that the two "ll"s in the Twitter handle were actually a capital "i" and lowercase "L." So in Twitter's app, it looks like a capital "ll" when in reality it spells his name with an "il." I notified someone at Twitter late last night (see the timestamp of the screenshot) and asked if this was a Twitter bug, or a fake account and they said they would investigate. It turns out, it was the latter."

The fake op-ed gained some credence in part because it comes days after Bill Keller made new comments about Wikileaks to GigaOm's Mathew Ingram. In fact, the fake op-ed take excerpts from Mathew Ingram's post.

The fake NYT op-ed was accompanied by a fake PayPal blog post which seemed to be responding to Keller.

Glenn Greenwald has a good post up that does a thorough reconstructing of how the hoax spread and about what he sees as the lessons of this episode.

ShortFormBlog did a quick side by side comparrison of the fake versus the real NYT opinion site.

Twitchy has a play by play post up in which Nick Bilton explains how and why the hoax fooled him.