Hi TK,
You are right that the truck driver Iyman Faris [aka Mohammad Rauf] was a central character in this story. A TIME.com article in May said this...
http://www.time.com/time/nation/article/0,8599,454469,00.html Soon after Iyman Faris agreed to cooperate with FBI agents, he was brought to a safe house in Virginia where agents directed and monitored his every communication, including cell phone and e-mail messages to his bosses, TIME's Daniel Eisenberg reports. "He was sitting in the safe house, making calls for us," says a Justice Department official.
...
The FBI and federal prosecutors are investigating a group of at least a dozen mostly Muslim men in the Washington area who studied under a local Islamic scholar. Investigators are also focusing on some Maryland-based associates of Faris acquaintance Majid Khan, a onetime resident of Baltimore who U.S. officials say was tapped by al-Qaeda to lead an operation to blow up gas stations in the U.S., TIME reports.
[a U.S. indictment of Faris accuses him of working for Osama Bin Laden, and Khalid Sheikh Mohammed and points out that 'gas stations' was a code word for acetylene torches used to destroy U.S. commuter bridges and trains]
John Allen Muhammad's sniper-car co-owner Nathaniel Osbourne was also studying to be a truck driver.