The landing page for the 60K offer (redirecting to 30K offer as of 7/2/2012)
The application page for the 60K offer (dead as of 8/1/2013)
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[Update 1/1/2013] The 50K link has expired.
[Analysis 5/12/2012] The old 50K offer (up to $665 for travel redemption) with 1st year annual fee waiver (saving $125) is still alive. The spending requirement is $2,500 within 3 months. Considering with the new 60K offer, you only gain an extra 10K points ($133 value for travel) but pay $125 plus $1,500 in spending, the old offer is easier for most people. However, if you are considering keeping the card after the 1st year, the 60K offer will make more sense.
[Update 7/5/2012] Since this 50K offer allows you to choose between Visa or MasterCard in the application, it is possible to apply both to get 100,000 points. The key is to make two applications, one for Visa and one for MasterCard, in two browsers on the same day. If you could get both applications approved, you could earn 100,000 points.
The landing page for the 50K offer (redirecting to Citi homepage as of 7/16/2012)
The application page for the 50K offer (not working as of 1/1/2013)