Bygones must be bygones on the presidential retirement circuit: Ex-presidents Bill Clinton and George W. Bush are set to make their second joint appearance since Bush left office, as both men will speak at the TD Ameritrade Institutional 2010 National Conference in Orlando, Florida next year. The subject is the future of the financial-services industry, and the two will appear for an hour-long discussion. In their first joint appearance, Bush referred to Clinton as his “brother.”