LINK

Note: The $600 bonus consists of
- $500 in gift cards that can be exchanged for 50000 bonus points
- $100 in gift cards that can be exchanged for 10000 bonus points, after $10,000 spending requirement is fulfilled.

Basically, this bonus converts cashback rate of this card for regular purchases from 1% to 6% during the first year (if bonus requirements are met).

Terms:

To be eligible to receive the bonus points, you must (1) apply for the new Business Gold Rewards Card from American Express OPEN using Bonus ID 6752 prior to termination of this offer, but in no event later than November 28, 2011, and (2) charge $10,000 of eligible purchases on the Business Gold Rewards Card in the first 150 days of Card membership. The bonus points will be credited to your Membership Rewards® account 6-8 weeks after you have met the purchase requirement. Offer limited to 50,000 bonus points per Card account. Existing American Express OPEN Gold Card members are not eligible for this offer. This is a limited time offer, which may be terminated by American Express at any time. Offer may not be combined with any other promotional offers. Membership Rewards program terms and conditions apply.

No Annual Fee your first year, a savings of $175.