I just saw this 75,000 point offer on the American Express
Business Gold Rewards card (this isn't an affiliate link which pays me a commission) after spending $10,000 within 4 months while browsing online.
However, the terms indicate that the offer is valid only for applications received by
February 29, 2012 and doesn't specify in which timezone the offer ends.
This is much better than the regular offer of ZERO points.
I posted it on my blog along with a screenshot of the offer (in case it is needed later on).