Come October 1, 2013, there will be important changes when a shipper uses a broker. For reference see this DC Velocity article:
Come October 1, carriers can not broker a load out a shipper has given to them. This is called double brokering and has been common. Interline shipments is still allowed.
When a shipper uses a broker, the bill of lading must list the actual carrier handling the freight. The broker or 3PL can be listed separately and notations that they are going to be paid.
Brokerage surety requirements will increase to $75,000 from $10,000. Some people believe this increase will knock out many smaller brokers. $10,000 is almost nothing in today’s dollars and I view the increase as appropriate.