Expensive business routers manufactured by Cisco, Ericsson and others using BGP (Border Gateway Protocol) have recently taken the interest of hackers for vulnerability of those routers, handling ISPs traffic, including personal data stored by ISP.
This should concern shoppers who have opted to store their credit card and other personal information permanently online at their ISP's servers for "quicker checkout during shopping" - feature offered by many like AOL Quick Cash and Amazon.
Routers by these manufacturers are often a part of your Internet Service Provider's network. US Defense Department and Verizon are developing a new Border Gateway Protocol - in the mean time - beware and every time enter personal info online manualy.