[cobralibre]

Maciej Ceglowski had a similar, if less grandiose, site called Wrong Tomorrow, but it looks like it's down:

http://wrongtomorrow.com/

I don't know if the site is only temporarily down, or if it's been abandoned, but it's a shame if the latter. The idea behind Wrong Tomorrow was chiefly to hold pundits accountable for their frequently bad predictions. You can read his site announcement, where he explicitly mentions sites like Long Bets and how Wrong Tomorrow differs from them:

http://idlewords.com/2009/04/wrong_tomorrow.htm

[gwern]

I believe the right URL had a prefixed www. (During some downtime, but not this one apparently, http://wrongtomorrow.com didn't work but http://www.wrongtomorrow.com did.)

Back in July, Maciej told me

> It's not abandoned, but I had to take it down since a sister site on that server was getting high traffic, and needed the resources.

I began copying over predictions from Wrong Tomorrow and Long Bets to http://predictionbook.com/ and I found that a bunch of Wrong Tomorrow predictions were corrupted/unavailable, and told Maciej about them; no reply. So I think it's safe to say that Wrong Tomorrow has been pretty much abandoned.

[neilk]

It was a brilliant idea, but waiting five years just to prove pundits wrong depletes my strategic reserves of spite.