I thought the idea of the Two Browser Trick was that you could get 2 cards for the price of one credit inquiry. It is most effective with AA cards since you can normally only get one personal AA card every 18 months, unless you apply for 2 on the same day. If you use the same browser for both applications, one is sometimes cancelled as a duplicate application.

You can apply for 2 Citi Premier Thank You Point cards in one day for 100,000 points, or 2 Citi Hilton Honors Visas for 100,000 Hilton points. This will work even if you don't apply on the same day, except you will get 2 inquiries. I think Citi limits most people to 2 approvals every 60 or 90 days.