New from the National Invasive Species Council is a report describing vectors of invasive species introduction, and how to rank them according to priority. The entire report, created by a task force for the NISC, can be downloaded as a Word document directly from this link. There doesn't seem to be any web-based summary of this amazingly well-researched document, though you can read more about pathways here.
Thanks to a member of the ALIENS-L listserver (who is also one of the authors) for posting information about the report.
