themittani.com has an excellent article out detailing Goonswarm ganking efforts in highsec. Eve Fail responded to this with a post about the impact on his logistics line. I found data for 423 highsec freighter ganks to date in 2012 and wanted to present some hard numbers to illistraute to scale of impact that highsec freighter ganks have on hauling traffic.
Ganks by System
Ganks by Alliance