Project Gunrunner, often referred to with the sarcastic term "Gunwalker" is an ATF program that started in the mid 2000's. FFL's (Federal Firearms Licensees) in the border areas were asked to report suspicious transactions and those weapons would be entered into an ATF tracking database. When possible the suspected straw purchaser was tracked down and arrested.
Operation Fast and Furious is an offshoot of the Gunrunner program based in Phoenix. It was essentially an expansion of the Gunrunner MO with the stated purpose of tracking weapons to drug cartels. The difference with F&F is that ATF didn't arrest anyone. The weapons got sold, were entered in the database and accounted for only when they showed up at a crime scene....such as the shooting of Brian Terry.