Forget firewalls. Johnny Long can steal your company's data through the front door.

London remains the global economy's most influential city, according to the 2008 MasterCard Worldwide Centers of Commerce Index(TM), an annual research initiative designed to evaluate and rank how major cities compare in performing critical functions that connect markets and commerce

They're single, wealthy and part of the most exclusive club on earth.

Travellers flying to the United States from next January will need to supply personal details to the country's authorities using an online form at least three days before they fly.